Repro & Digestive Systems: Spermatogenesis, Vas Deferens, Ovarian Blood & Uterus, Exercises of Medicine

Download Repro & Digestive Systems: Spermatogenesis, Vas Deferens, Ovarian Blood & Uterus and more Exercises Medicine in PDF only on Docsity! 72 Anatomy Questions 100. Which of the following stimulus does not induce visceral pain - (AI - 99) a. Distension b. Pressure c. Cauterisation d. Cutting 101. Length of a spermatozoa - (CUPGEE 02) a. 50µm (micrometers) b. 100µm c. 120µm d. 500µm 102. The first event to occur in the micturition reflex is - (AIIMS 98) a. Relaxation of sphincter b. Detrusor contraction c. Relaxation of perineal muscles d. Activity of EMG stops at external sphincter 103. Hydatids of morgagni are - (JIPMER 79, Bihar 89) a. Hydatid cysts in the brain b. Hydatid cysts in the thorax c. Subcutaneous hydatid cysts d. None of the above 104. Capacity of stomach of newborn - (Calcutta 2K) a. 20 ml b. 30 ml c. 50 ml d. 100 ml 105. Lymphatics of ovary drains into (AI 91) a. Paraaortic LN b. Internal iliac LN c. External iliac LN d. Obturator LN Abdomen 72 Abdomen 73 106. All are supports of uterus except - (AIIMS 92) a. Uterosacral ligament b. Round ligament of uterus c. Mackenrodts ligament d. Transverse cervical ligament 107. The sensory nerves from the cervix pass through the - (DNB 89) a. Lumbar 4,5 b. Sacral 2,3,4 c. Pudendal nerve d. Ilio inguinal nerve 108. The branches of internal iliac artery include all of the following except - (KAR 94) a. Uterine artery b. Middle rectal artery c. Obturator artery d. Inferior epigastric artery 109. The principal factor causing the rupture of the graafian follicle is - (kerala 2K) a. Increase in the intra follicular pressure b. Necrobiosis of the overlying tissue c. All of the above d. None of the above 110. The superior rectal artery arises from the - (AIIMS 85) a. Superior mesenteric artery b. Inferior mesenteric artery c. Internal iliac artery d. Internal pudendal artery 111. Appendicular artery is a branch of - (PGI 85) a. Ileocolic artery b. Right colic artery c. Middle colic artery d. Posterior cecal artery 112. The length of CBD is - (PGI 85) a. 5 cm b. 7.5 cm c. 8.0 cm d. 9 cm 76 Anatomy 126. Structure found in the superficial perineal space (pouch) of the male include the - (PGI 78,82) a. Bulb of the penis b. Bulbo spongiosus muscle c. Ischiocavernosus muscle d. Superficial transverse perinei muscles e. None 127. The posterior wall of inguinal canal are formed by many structures that include - (JIPMER 79, PGI 87) a. Conjoint tendon b. Transversus abdominis c. Fascia transversalis d. Lacunar ligament 128. Which of the following statements concerning the nerve supply to the urinary bladder is / are correct (PGI 80) (AIIMS 83) a. The sympathetic post ganglionic fibre originate in the first and second lumbar ganglia b. The parasympathetic preganglionic fibres synapse with post. ganglionic neurons in the inferior hypogastric plexus c. The afferent sensory fibres arising in the bladder reach the spinal cord via the pelvic splanchnic nerves and also travel with the sympathetic nerves d. The parasympathetic preganglionic fibres arise from S2, S3, S4 e. All of the above 129. The right suprarenal gland is related to the - (JIPMER 80, PGI 81) a. Third part of the duodenum b. Inferior vena cava c. Transverse colon d. Right lobe of the liver 130. The coeliac nodes receive lymphatic drainage from the - (JIPMER 80, AMC 84) a. Liver b. Spleen c. Pancreas d. Duodenum e. All of the above Abdomen 77 131. Parasympathetic outflow from sacral plexus is - (JIPMER 81, AP 91) a. Nervi Erigentes b. Nerve of Kuntz c. Arnold’s nerve d. Jacobson’s nerve 132. The urinary bladder in the male is - (PGI 81,82) a. Posterior to the pubic symphysis b. Anterior to the ampulla of the vas deferens c. Superior to the prostate gland d. Superior to the seminal vesicles 133. Superficial fatty fascia between umbilicus & pubis is - (PGI 82) a. Camper’s b. Scarpa’s c. Colle’s d. Clli’s 134. The rectus sheath contains all of the following except - (AIIMS 82, AI 88) a. Pyramidalis muscle b. Genitofemoral nerve c. Inferior epigastric d. Superior epigastric vessels 135. The normal constrictions of the ureter are found - (AIIMS 83, PGI 87, 79) a. Where the ureter begins at the junction of the renal pelvis and the ureter b. Where the ureter passes through the bladder wall c. Where the ureter crosses the common iliac artery or the pelvic brim d. Where the ureter passes through the cardinal ligament 136. The chief blood supply of the greater omentum is _artery - (PGI 83) a. Gastroduodenal b. Right gastroepiploic c. Left gastroepiploic d. Superior pancreaticoduodenal 137. The boundaries of morison’s pouch are - (PGI 84) a. Inferior surface of liver b. Anterior abdominal wall c. Falciform ligament d. Peritoneum over right kidney e. Coronary ligament 78 Anatomy 138. Nerve supply of pyramidalis muscle is - (PGI 84) a. Ilioinguinal nerve b. Subcostal nerve c. Genitofemoral nerve d. None 139. It is true that the gall bladder - (AIIMS 84) a. Is supplied by cystic artery which has an accompanying vein on its left side b. Is drained by veins into the liver c. Has a fundus which projects beyond the liver d. Has an infundibulum which projects downwards joining a pouch 140. The superior mesenteric artery arises opposite the vertebra - (AIIMS 85) a. T12 b. L1 c. L2 d. L3 141. The right adrenal vein drains into - (AIIMS 85) a. Right renal vein b. I.V.C c. Lumbar veins d. Left renal vein 142. Deep inguinal ring is a defect in the - (UPSC 85, PGI 87, JIPMER 87, AI 88, Kerala 90) a. External oblique b. Internal oblique c. Transversus abdominis d. Transversus fascia e. Peritoneum 143. Carcinoma prostate commonly occurs in the (PGI 85) a. Anterior b. Posterior c. Lateral d. Middle Abdomen 81 157. Xiphisternal junction is usually at the level of disc between the following thoracic vertebra - (DNB 90) a. 9 and 10 b. 8 and 7 c. 1 and 12 d. None 158. The attachment of the mesentery of the small gut is - (PGI 90, AIIMS 86) a. Lt. transverse process of L2 to Rt. sacroiliac joint b. Rt. transverse process of L2 to Rt. sacroiliac joint c. Lt. transverse process of T1 to Rt. sacroiliac joint d. Rt. transverse process of T1 to Lt. sacroiliac joint e. None of the above 159. Embryonic ventral mesogastrium gives rise to - (AIIMS 91) a. Greater omentum b. Lesser omentum c. Pelvic mesocolon d. Gastro splenic ligament 160. Urethra of female - (DNB 91) a. Has only connective tissue in its upper third b. Has only smooth muscle in its wall c. Is shorter than in male d. Is longer than in male 161. Duodenum is developed from - (TN 91) a. Foregut b. Midgut c. Foregut & midgut d. Hindgut 162. The following is true regarding spleen - (AIIMS 91) a. Notch is on inferior border b. Long axis parallel to 12th Rib c. Developed form ventral mesogastrium d. Nerve supply from coeliac plexus 163. The inferior hypogastric plexus is located (SGPGI 04) a. Anterior to aorta b. Behind the kidney c. Between layers of anterior abdominal wall d. On the side of rectum 82 Anatomy 164. The efferent limb of the cremaster reflex is provided by the - (UP PGMEE 04) a. Femoral branch of genitofemoral nerve b. Genital branch of the genitofemoral nerve c. Ilioinguinal nerve d. Pudendal nerve 165. Blood supply of stomach is / are : (PGI 03) a. Left gastric artery b. Short gastric artery c. Splenic artery proper d. Renal artery e. Lt. gastroepiploic artery 166. Blood vessel related to paraduodenal fossa is - (AI-03) a. Gonadal veins b. Superior mesenteric artery c. Portal vein d. Inferior mesenteric vein 167. The first costochondral joint is a - (AI - 04) a. Fibrous joint b. Synovial joint c. Syndesmosis d. Synarthrosis 168. Blood supply of sigmoid colon is by (PGI 2000) a. Middle colic A b. Marginal artery c. Left colic artery d. Sigmoid artery 169. Not true about the anal canal is (PGI 99) a. Completely lined by stratified squamous epithelium b. Supplied by pudendal nerve c. Drained by veins forming portosystemic anastomosis d. Part below pectinate line is supplied by inferior rectal artery 170. All the statements are true about ileum except (PGI 98) a. LN in mesentery b. 3-6 arcades in continuation c. Smaller diameter than jejunum d. Large circular mucosal folds Abdomen 83 171. True about foramen of bochdalek is (PGI 97) a. Postero lateral gap in diaphragm b. Anterolateral gap in diaphragm c. Pleuro-pericardial gap d. Gap in muscle fibres 172. A patient of external piles has pain, which of the following nerves carry this pain sensation (AI - 2002) a. Hypogastric nerves b. Parasympathetic plexus c. Sympathetic nerve d. Pudendal nerve 173. The architecture of liver is divided into lobes by (PGI 2002) a. Bile duct b. Hepatic artery c. Hepatic vein d. Portal vein e. Lymphatics 174. The contents of the sacral canal are all except - (AI 93) a. Filum terminale b. Dura c. L4-L5 Nerve roots d. Vertebral venous plexus 175. Epoophoron is a remnant of (PGI 95) a. Wolffian duct b. Mullerian duct c. Gubernaculum d. None 86 Anatomy contracts. In the males, the last drops of urine is expelled from the bulbar portion of urethra by contraction of the bulbospon- giosus. 103. (d) None of the above (Ref : BDC 4th/e vol. II - pg 220) Embryological remnants present in relation to testes There importance is that they may sometimes form cysts (1) The appendix of testis (2) The appendix of epididymis or pedunculated hydatid of morgagni is a small rounded, pedunculated body attached to the head of the epididymis. It represents the cranial end of the mesonephric duct (3) Superior aberrant ductules, one or two, are attached to the tail of the epididymis and represent the intermediate mesonephric tubules. One of them which is more constant may be as long as 25cm. (4) The paradidymis or organ of Giraldes consists of free tubules lying in the spermatic cord above the head of epididymis. They are neither connected to the epididymis, nor to the testis and represent the caudal mesonephric tubules. 104. (b) 30ml (Ref : BDC 4th/e vol. II - pg 238, 243) Size of the stomach : ♦ 25cm long ♦ Mean capacity is 30ml (one ounce) at birth and, one litre at puberty ♦ 1.5 to 2 liters or more in adults Two orifices :- ♦ Cardiac orifice : - Joined by lower end of esophagus - Lies behind the left 7th costal cartilage 2.5cm from its junction from sternum, at T11 vertebral level - There is physiological evidence of sphincteric action at this site, but a sphincter cannot be demonstrated anatomically ♦ Pyloric orifice : - Opens into duodenum - In an empty stomach and in supine position, it lies 1.2cm to the right of median plane at the level of the lower border of vertebra L1 or transpyloric plane - Gastric pain is felt in the epigastrium because the stomach is supplied from segments T6 to T10 of the spinal cord, which also supply the upper part of the abdominal wall. Pain is produced either by spasm of muscle or by over distention. Ulcer pain is attributed to local spasm due to irritation Abdomen 87 - Peptic ulcer can occur in sites of pepsin and hydrochloric acid namely the (a) Stomach (b) First part of duodenum (c) Lower end of esophagus and (d) Meckel’s diverticulum ♦ Gastric ulcer occurs typically along the lesser curvature due to : (1) It is homologous to the gastric trough of ruminants (2) Mucosa is not freely movable over the muscular coat (3) The epithelium is comparatively thin (4) Blood supply is less abundant and there are fewer anasto- moses (5) Nerve supply is more abundant with large ganglia (6) Because of the gastric canal, it receives most of the insult from irritating drinks. (7) Being shorter in length the wave of the contraction stays longer at a particular point, Viz., the standing wave of incisura. ♦ Gastric carcinoma is common and occurs along the greater curvature. - Metastasis can occur through the thoracic duct to the left supra clavicular lymph node (Troisier’s sign) ♦ Pyloric obstruction can be congenital or acquired. It causes - Visible peristalsis in the epigastrium - and vomiting after feeds/ meals 105. (a) Para- aortic LN (Ref : BDC 4th/e vol. II - pg 355) Ovary Arterial supply :- (1) The ovarian artery : arising from the abdominal aorta just below the renal artery - via the suspensory ligament of ovary - sends branches through the mesovarium - continues medially through broad ligament of uterus to anastomose with uterine artery (2) The uterine artery - through mesovarium Venous drainage :- ♦ Vein emerges at hilus of ovary - forming a pampiniform plexus - forming a vein at pelvic inlet and the right ovarian vein drains into
IVC; left ovarian veins drains into
(Lt) Renal vein Lymphatic drainage : The lymphatics from the ovary communicate with the lymphatics from the uterine tube and fundus of the uterus. They ascend along the ovarian vessels to drain into the lateral aortic and preaortic nodes. Nerve supply :- The ovarian plexus : derived from (1) Renal (2) Aortic 88 Anatomy (3) Hypogastric plexus
Accompanies the ovarian artery
It contains both sympathetic and parasympathetic nerves
Sympathetic nerves (T10, T11) are afferent for pain as well as efferent or vasomotor
Parasympathetic nerves (S2,S3,S4) are vasodilators 106. Ans : None (Ref : BDC 4th/e vol. II - pg 361) The uterus is supported by the following factors/ structures :- Primary supports (A) Muscular or active supports : (1) Pelvic diaphragm (2) Perineal body (3) Urogenital diaphragm (B) Fibromuscular or mechanical supports (1) Uterine axis (2) Pubocervical ligaments (3) Transverse cervical ligaments of - Mackenrodt (4) Uterosacral ligaments (5) Round ligaments of uterus Secondary supports :- These are of doubtful value :- (1) Broad ligaments (2) Uterovesical folds of peritoneum (3) Rectovaginal fold of peritoneum (Gray’s 39th/e pg 1333) says that “While the uterosacral and transverse cervical ligaments may act in varying measures as mechanical supports of the uterus, levator ani and coccygei, the urogenital diaphragm and perineal body appear at least as important in this respect” (Shaw’s textbook of Gynaecology, 13th/e pg 10,17,19) states that ‘Prolapse of the genital tract, stress incontinence of urine and faecal incontinence are all related to laxity & atonicity of the muscles of the pelvic floor as well as denervation of pelvic nerves during childbirth’ and “The supports of uterus and the bladder are seen to be triradiate condensation of endopelvic fascia :- (1) The anterior spoke is the pubocervical fascia or so called pubocervical ligament (2) The lateral spoke is the mackenrodt’s ligament (3) The posterior spoke is the uterosacral ligament and “There is no evidence that the normal position of anteflexion & anteversion of the uterus is produced by contraction of the round ligament”. So only B.D.C. mentions round ligament as one of the supports of uterus. Abdomen 91 (1) Inferior pancreatoduodenal (2) Middle colic (3) Right colic (4) Iliocolic ♦ From the left are 12-15 jejunal & ileal branches. Coeliac trunk :- ♦ Artery of the foregut ♦ Supplies - (1) Lower end of oesophagus (2) Stomach and upper part of duodenum upto the opening of common bile duct (3) The liver (4) The spleen (5) The greater part of the pancreas Branches :- (1) Left gastric artery (2) Common hepatic artery (a) The gastroduodenal artery (1) Right gastroepiploic (2) Superior pancreatoduodenal (b) The right gastric artery (c) The supraduodenal artery (d) The cystic artery (3) Splenic artery - the largest branch of coeliac trunk (a) Numerous pancreatic branches (b) 5 - 7 short gastric arteries (c) Left gastroepiploic artery 111. (a) Ileocolic artery (Ref : BDC 4th/e vol. II - pg 258) Blood supply of appendix : ♦ The appendicular artery is a branch of the lower division of the ileocolic artery ♦ It runs behind the terminal part of ileum & enters the mesoappendix at a short distance from its base ♦ Here it gives a recurrent branch which anastomoses with a branch of posterior caecal artery ♦ The main artery runs towards the tip of the appendix lying at first near to and then in the free border of the mesoappendix ♦ The terminal part of the artery lies actually on the wall of the appendix ♦ Blood from the appendix is drained by the appendicular, ileocolic and superior mesenteric veins to the portal vein ♦ Most of the lymphatics
ileocolic nodes, but a few of them pass directly through
appendicular nodes situated in the mesoapp- endix. 92 Anatomy 112. (c) 8cm (Ref : BDC 4th/e vol. II - pg 275) Hepatic ducts : ♦ The right and left hepatic ducts emerge at the porta hepatis from the right & left lobes of the liver ♦ The arrangement of structures at the porta hepatis from behind forwards is (1) Branches of the portal vein (2) Hepatic artery (3) Hepatic ducts Common hepatic duct :- ♦ Formed by the union of the right & left hepatic ducts near the right end of the porta hepatis ♦ It runs downwards for about 3cm and is joined by on its right side at an acute angle by cystic duct Cystic duct :- ♦ Cystic duct is about 3-4cm long ♦ The mucous membrane of cystic duct forms a series of 5 to 12 crescentric folds, arranged spirally to form the so called “ spiral valve” of Heister. This is not a true valve. Bile duct : ♦ Bile duct is formed by union of cystic duct & common hepatic ducts ♦ It is 8cm long and has a diameter of about 6mm Relations of bile duct :- (A) Supraduodenal part in the free margin of lesser omentum (1) Anteriorly : liver (2) Posteriorly - portal vein & epiploic foramen (3) To the left - Hepatic artery (B) Retroduodenal part : (1) Anteriorly - First part of duodenum (2) Posteriorly - Inferior vena cava (3) To the left - Gastroduodenal artery (C) Infraduodenal part : - (1) Anteriorly - A groove in the upper & lateral parts of the posterior surface of the head of the pancreas (2) Posteriorly - Inferior vena cava (D) Intra - duodenal part 113. (b) IVC and ligamentum venosum (Ref : BDC 4th/e vol. II - pg 289) Lobes of liver (Anatomical) ♦ The liver is divided into right and left lobes by the attachment of the - falciform ligament - anteriorly & superiorly - fissure for the ligamentum teres inferiorly - fissure for the ligamentum venosum Abdomen 93 ♦ The right lobe presents the caudate & the quadrate lobes ♦ The caudate lobe is situated on the posterior surface and is bounded on the right by the groove for IVC and on the left by the fissure for the ligamentum venosum and inferiorly by porta hepatis ♦ The quadrate lobe is situated on the inferior surface and is rectangular, bounded - anteriorly
inferior border of liver - posteriorly
porta hepatis - On right
fossa for the gall bladder - On left
fissure for ligamentum teres 114. (d) L1 - L2 (Ref : BDC 4th/e vol. II - pg 194) The transpyloric plane : ♦ The transpyloric plane is an imaginary transverse plane often referred to in anatomical descriptions ♦ Anteriorly, it passes through the tips of the ninth costal cartilages and posteriorly, through the lower part of the body of the first lumbar vertebra. ♦ The plane lies midway between the suprasternal notch and the pubic symphysis ♦ It is roughly a hand’s breadth below the xiphi-sternal joint ♦ The costal margin reaches its lowest level in the mid - axillary line. Here the margin is formed by the tenth costal cartilage ♦ The transverse plane passing through the lowest part of the costal margin is called the subcostal plane ♦ Posteriorly subcostal plane passes through the third lumbar vertebra 115. (c) Fascia between the rectal ampulla and the prostate and the seminal vesicles (Ref : BDC 4th/e vol. II - pg 380) Supports of rectum (1) Pelvic floor formed by levator ani muscles (2) Fascia of waldeyer :- It attaches the lower part of the rectal ampulla to the sacrum. It encloses the superior rectal vessels and lymphatics (3) Lateral ligaments of the rectum :- They are formed by condensation of the pelvic fascia on each side of the rectum. They enclose the middle rectal vessels, the branches of pelvic plexuses, and attach the rectum to the posterolateral walls of the lesser pelvis (4) Rectovesical fascia of denonvilliers :- It extends from the rectum behind to the seminal vesicles and prostate in front 96 Anatomy ♦ It can be caused by (a) Cirrhosis of liver - vascular bed of liver is markedly obliterated (b) Banti’s disease (c) Thrombosis of portal vein Effects of portal hypertension are : (a) Congestive splenomegaly (b) Ascites (c) Collateral circulation through the portosystemic communications - It forms (1) Caput medusae around umbilicus (2) Oesophageal varices at lower end of esophagus (3) Hemorrhoids in the anal canal may be responsible for repeated bleeding per rectum 119. (c) Left Renal Vein (Ref : Gray’s 39th/e pg 1047,1048, 1049)
The initial venous channels in the early embryo have traditionally been termed cardinal because of their importance at this stage
The cardinal venous complexes are first represented by 2 large veins on each side
The pre- cardinal position is rostral to the heart. The post - cardinal position is caudal to the heart
The 2 veins on each side unite to form a short common cardinal vein, which passes ventrally, lateral to pleuropericardial canal, to open into the corresponding horn of the sinus venosus ♦ The post - cardial veins
drain the body wall in early embryo, are insufficient to drain developing mesonephros and gonads and for the growing body wall. ♦ As the embryo increases in size, they are supplemented by a range of bilateral longitudinal channels that anastomoses with the posterior cardinal system They are as follows : ♦ Subcardinal - assume the drainage of the mesonephros, they intercommunicate by a pre-aortic anastomotic plexus which constitutes the part of left renal vein ♦ Supra cardinal - also referred to as thoracolumbar line or lateral sympathetic line ♦ Azygos line ♦ Subcentral ♦ Precostal veins ♦ The subcardinal veins are, as indicated, lateral to the aorta and sympathetic trunks, which therefore intervene between them and the azygos lines ♦ They communicate caudally with the iliac veins and cranially with the subcardinal veins in the neighborhood of the pre-aortic inter Abdomen 97 subcardinal anastomoses ♦ The supracardinal veins
communicate through
Azygos lines and subcentral veins ♦ The most cranial of these connections together with the supracardinal - subcardinal and the inter subcardinal anastomoses complete a venous ring around the aorta below the origin of the superior mesenteric artery, termed ‘renal collar’. 120. (b) Membranous (Ref : BDC 4th/e vol. II - pg 349) Prostatic part of urethra :- ♦ 3cm long ♦ begins at the internal urethral orifice ♦ runs vertically downwards through the anterior part of the prostate ♦ it is the widest and the most dilatable part of the male urethra in its middle part, and narrowest where it joins the membranous urethra Membranous part of urethra :- ♦ 1.5 - 2cm long and runs downwards & slightly forwards through the deep perineal space and pierces and the perineal membrane about 2.5cm below & behind pubic symphysis ♦ With the exception of the urethral orifice, this is the narrowest and least dilatable part of the male urethra ♦ It is surrounded by the sphincter urethrae or external sphincter ♦ The bulbourethral glands of cooper are placed one on each side of the membranous urethra, although their duct opens into spongy part of the urethra after piercing the perineal membrane ♦ The penile / spongy urethra :- - 15cm long - fixed part which runs forwards & upwards in the bulb of the penis - penile urethra is narrow with the uniform diameter of 6mm in the body of penis - dilated at commencement - to form the intra bulbar fossa and within the glans penis to form the navicular or terminal fossa. - the external urethral orifice is the narrowest part of the male urethra - it forms a sagittal slit about 6mm long. 121. (d) Parietal peritoneum (Ref : BDC 4th/e vol. II - pg 222) The peritoneum is in the form of a closed sac which is invaginated by a number of viscera. As a result the peritoneum is divided into : (1) An outer (or) Parietal layer (2) An inner (or) visceral layer (1) Parietal peritoneum :- - lines inner surface of abdominal wall & pelvic walls & lower 98 Anatomy surface of diaphragm - easily be stripped - derived from the somatopleural layer of the lateral plate mesoderm - blood supply and nerve supply are the same as those of the overlying body wall - because of the somatic innervation, parietal peritoneum is pain sensitive (2) Visceral Peritoneum :- - lines the outer surface of viscera, to which it is firmly adherent - cannot be stripped - derived from the splanchnopleural layer of the lateral plate mesoderm - blood supply & nerve supply are the same as those of the underlying viscera - because of the autonomic innervation, visceral peritoneum evokes pain when viscera is stretched, ischemic, or distended 122. (d) (a) and (c) are true (Ref : BDC 4th/e vol. II - pg 312) Diaphragm develops from the following sources :- (1) Septum transversum forms the central tendon (2) Pleuroperitoneal membranes form the dorsal paired portion (3) lateral thoracic wall contributes to the circumferential portion of the diaphragm (4) dorsal mesentery of oesophagus forms the dorsal unpaired portion 123. (a) Anteriorly by the stomach, (c) Posteriorly by the pancreas (Ref : BDC 4th/e vol. II - pg 232, 240) Lesser sac or omental bursa :- ♦ This is a large recess of the peritoneal cavity behind the stomach, the lesser omentum and the caudate lobe of liver ♦ It is closed all around, except in the upper part of its right border where it communicates with the greater sac through the epiploic foramen Borders :- Anterior wall :- (1) Caudate lobe of liver (2) Lesser omentum (3) The stomach (4) The anterior two layers of the greater omentum Posterior wall :- (1) Structures forming the stomach bed (2) Posterior layers of greater omentum Abdomen 101 on each side of these 2 orifices. These unite and get attached to the glans clitoridis. Muscles on each side (a) Ischiocavernosus covering (a) Ischiocavernosus covering the the corpora cavernosa of corpora cavernosa of clitoris penis (b) Bulbospongiosus covering (b) Bulbospongiosus covering corpus spongiosum, both bulb of vestibule. These remain are united by a median raphe separated to give passage to urethra & vagina (c) Superficial transverse (c) Superficial transverse perinei perinei ♦ Bulb of penis is covered by bulbospongious 127. (a) Conjoint tendon (c) Fascia transversalis (Ref : BDC 4th/e vol. II - pg 208) ♦ The deep inguinal ring is marked 1.2cm above the midinguinal point, as an oval opening ♦ The superficial inguinal ring is marked immediately above the pubic tubercle as a triangle with its centre 1cm above and lateral to the pubic tubercle Boundaries :- (A) The anterior wall is formed by - (a) In its whole extent (1) Skin (2) Superficial fascia (3) External oblique aponeurosis (b) In its lateral one third : the fleshy fibres of the internal oblique muscle (B) The posterior wall :- In its whole extent : (1) Fascia transversalis (2) Extraperitoneal tissue (3) The parietal peritoneum In its medial 2/3rds (1) The conjoint tendon (2) At its medial end by the reflected part of the inguinal ligament (3) Over its lateral one third by the inter - foveolar ligament (C) Roof : By the arched fibres of the internal oblique and transver- sus abdominis muscles (D) Floor : By the grooved upper surface of the inguinal ligament and at the medial end by the lacunar ligament 102 Anatomy Structures passing through the canal : (1) The spermatic cord in males or the round ligament of the uterus in females, enters through deep ring and passes out through the superficial ring (2) The ilioinguinal nerve enters the canal through the interval between the external and internal oblique muscles and passes out through the superficial inguinal ring Constituents of the spermatic cord :- (1) Ductus deferens (2) The testicular and cremasteric arteries & the artery of the ductus deferens (3) The pampiniform plexus of veins (4) Lymph vessels from the testis (5) Genital branch of the genitofemoral nerve plexus of sympathetic nerves around the artery to the ductus deferens (6) Remains of the processus vaginalis 128. (e) All of the above (Ref : BDC 4th/e vol. II - pg 348) Nerve supply of the urinary bladder : ♦ Vesical plexus of nerves which is made up of fibres derived from the inferior hypogastric plexus ♦ It contains both sympathetic and parasympathetic components, each of which contains motor or efferent and sensory or afferent fibres (1) Parasympathetic efferent fibres or nervi erigentes S2,S3,S4 are motor to the detrusor muscle and inhibitory to the sphincter vesicae. If these are destroyed normal micturition is not possible (2) Sympathetic efferent fibres (T11 to L2) are said to be inhibitory to detrusor muscle and motor to sphincter vesicae (3) The somatic, pudendal nerve (S2,S3,S4) supplies the sphincter urethrae which is voluntary (4) Sensory nerves : - Pain sensations, caused by distension or spasm of the bladder wall are carried mainly by parasympathe- tic and partly by sympathetic nerves. - In the spinal cord, pain arising in the bladder passes through the lateral spinothalamic tract and awareness of bladder distension is mediated through the posterior column - Bilateral anterolateral cordotomy therefore selectively abolishes pain without affecting the awareness of bladder distension and desire to micturate Urinary Incontinence : ♦ Emptying of the bladder is essentially a reflex function, involving the motor and sensory pathways, involving the motor and sensory Abdomen 103 pathways ♦ Voluntary control over this reflex is exerted through upper motor neurons, and as long as one pyramidal tract is functioning normally, control of the bladder remains normal ♦ Acute injury to the cervical / thoracic segments of the spinal cord leads to a state of spinal shock ♦ The muscle of the bladder is relaxed, the sphincter vesicae contracted but sphincter urethrae relaxed ♦ The bladder distends and urine dribbles ♦ After a few days, the bladder starts contracting reflexly. When it is full, it contracts every 2-4 hours. This is “automatic reflex bladder” ♦ Damage to the sacral segments of the spinal cord situated in lower thoracic and lumbar one vertebra results in “autonomous bladder”. The bladder wall is flaccid and its capacity is greatly increased. It just fills to capacity & overflows. So there is continuous dribbling. 129. (b) Inferior vena cava (d) Right lobe of the liver (Ref : BDC 4th/e vol. II - pg 306) Right suprarenal gland ♦ Triangular to pyramidal in shape ♦ Has - an apex - a base - an anterior and posterior surface - an anterior, medial & lateral border Relations :- ♦ Apex - related to the bare area of the liver ♦ Base - related to the upper pole of the right kidney Anterior surface : devoid of peritoneum, except for a small part inferiorly Related to - IVC medially - bare area of liver laterally - occasionally to the duodenum inferiorly Posterior surface : Right crus of diaphragm Anterior border - A little below the apex it presents the hilum where the suprarenal vein emerges Medial border : (1) Right coeliac ganglion (2) Right inferior phrenic artery Lateral border : It is related to the liver The left suprarenal gland and its parts & their relations Left suprarenal gland is semilunar : Upper end : It is related to the posterior end of the spleen lower end : Near the lower end is the hilum, through which the left suprarenal vein emerges 106 Anatomy descends to reach adult position after puberty Relations of the urinary bladder :- (1) Apex - Connected to umbilicus by median umbilical ligament which represents the obliterated embryonic urachus (2) Base - Female- Uterine cervix - Vagina Male - Upper part of base separated from rectum by rectovesical pouch containing coils of intestine - lower part : separated form rectum by seminal vesicles and the termination of vas deferens - The triangular area between the 2 deferent ducts is separated from rectum by the rectovesical fascia of Denonvilliers (3) Neck - Lowest most fixed part - Lies 3-4cm behind the lower part of the pubic symphysis (a little above the plane of pelvic outlet) - Pierced by internal urethral orifice - In males - rests on base of prostate - In females - it is related to the pelvic fascia which surrounds the upper part of the urethra. (4) Superior surface - In males - completely covered by peritoneum - contact with sigmoid colon - coils of terminal ileum - In females - peritoneum covers the greater part of the superior surface - except for a small area near the posterior border which is related to the supravaginal part of the uterine cervix - the peritoneum is reflected to the isthmus of the uterus to form vesicouterine pouch (5) Infero lateral surfaces - In males each surface is related to - pubis - puboprostatic ligaments - retropubic fat - levator ani - obturator internus - In female - relations are same except that the puboprostatic ligaments are replaced by the pubovesical ligaments ♦ As the bladder fills, the inferolateral surface form the anterior surface of the distended bladder, which is covered by peritoneum only in its upper part Abdomen 107 ♦ The lower part comes into the direct contact with the anterior abdominal wall, there being no intervening peritoneum ♦ This part can be approached surgically without entering the peritoneal cavity 133. (a) Camper’s fascia (Ref : BDC 4th/e vol. II - pg 195) Superficial fascia :- Below the level of umbilicus :- ♦ The superficial fascia of the anterior abdominal wall is divided into : (a) Superficial fatty layer called fascia of camper (b) Deep membranous layer called fascia of scarpa ♦ The fatty layer is continuous with the superficial fascia of the adjoining part of the body ♦ In the penis, it is devoid of fat, and in the scrotum, it is replaced by the dartos muscle ♦ The membranous layer is continuous below with a similar membranous layer of superficial fascia of the perineum known as colle’s fascia ♦ The attachments of scarpa’s fascia of the abdomen & of colle’s fascia of the perineum are such that they prevent the passage of extravasated urine due to rupture of urethra backwards into the thigh. ♦ The line of attachment passes over the following (a) Holden’s line (begins a little lateral to pubic tubercle and extends laterally for 8cm) (b) Pubic tubercle (c) Body of pubis & the deep fascia on the adductor longus and the gracilis near their origin (d) Margins of the pubic arch (e) The posterior border of the perineal membrane ♦ Above the umbilicus the membranous layer fuses with the fatty layer ♦ In the median plane, the membranous layer is thickened to form the suspensory ligament of the penis or of the clitoris. 134. (b) Genitofemoral nerve (Ref : BDC 4th/e vol. II - pg 206) Rectus sheath :- This is an aponeurotic sheath covering the rectus abdominus muscle. It has two walls anterior and posterior Formation of the walls :- (1) Above the costal margin : Anterior wall : External oblique aponeurosis Posterior wall: It is deficient, the rectus muscle rests directly on 108 Anatomy the 5th, 6th and 7th costal cartilages (2) Between the costal margin and arcuate line : Anterior wall : (a)External oblique aponeurosis (b) Anterior lamina of the aponeurosis of the internal oblique Posterior wall: (a) Posterior lamina of the aponeurosis of internal oblique (b) Aponeurosis of the transversus muscle Midway between the umbilicus & the pubic symphysis, the posterior wall of the rectus sheath ends in the arcuate line or linea semicircularis (or) fold of Douglas. The line is concave downwards (3) Below the arcuate line :- Anterior wall: All three aponeurosis, through the external oblique aponeurosis is separate, the other two are fused Posterior wall :Rectus muscle rests on fascia transversalis Contents : Muscles (1) The rectus muscle (2) The pyramidalis lies in front of the lower part of rectus abdominis Arteries (1) The superior epigastric artery (2) The inferior epigastric artery Veins (1) The superior epigastric vein
internal thoracic vein (2) The inferior epigastric vein
external iliac vein Supraumbilical median incisions : ♦ Through the linea alba have several advantages as been bloodless, safety to muscles and nerves but tend to leave a post operative weakness through which a ventral hernia may develop Infraumbilical median incisions : ♦ Are safer because the close approximation of the recti prevents formation of any ventral hernia Paramedian incisions : ♦ Through rectus sheath are more sound than median incisions. The rectus muscle is retracted laterally to protect the nerves supplying it from any injury. In these cases, the subsequent risk of weakness and of incisional or ventral hernia are minimal. 135. (a), (b), (c) are correct (Ref : BDC 4th/e vol. II - pg 301) Normal constrictions of ureter are : The ureter is slightly constricted at three places :- (1) At the pelviureteric junction (2) At the brim of the lesser pelvis Abdomen 111 (2) Fat Functions :- (1) Storehouse of fat (2) Protects against infections because of presence of macrophages in it, the collections of which appear to the naked eye as milky spots (3) Policeman of abdomen - moving to site of infection and sealing it off from surrounding areas. 137. (a), (b) and (e) (Ref : BDC 4th/e vol. II - pg 234) Hepatorenal pouch : (Morison’s pouch) Boundaries :- Anteriorly (1) The inferior surface of the right lobe of the liver (2) The gall bladder Posteriorly : (1) The right suprarenal gland (2) The upper part of right kidney (3) The second part of duodenum (4) The hepatic flexure of the colon (5) The transverse mesocolon (6) A part of the head of the pancreas Superiorly : The inferior layer of the coronary ligament Inferiorly : It opens into the general peritoneal cavity ♦ It is the most dependant (lowest) part of the abdominal cavity proper when the body is supine ♦ It is the commonest site of a subphrenic abscess, which may be caused by spread of infection from the gall bladder, the appendix, or other organs in the region 138. (b) Subcostal nerve (Ref : BDC 4th/e vol. II - pg 202) Pyramidalis muscle : ♦ This is a small rudimentary muscle in humans ♦ It arises from the anterior surface of the body of pubis and then the fibres pass upwards and medially to be inserted into linea alba ♦ Supplied by subcostal nerve (T12) ♦ It is said to be a tensor of the linea alba, though the need for such an action is not clear ♦ Rectus abdominis and pyramidalis form the muscular contents of the rectus sheath 139. (b) and (c) are correct (Ref : BDC 4th/e vol. II - pg 274, 276) 112 Anatomy ♦ The cystic artery is the chief source of blood supply distributed to - gall bladder - cystic duct - the hepatic ducts - upper part of bile duct ♦ Venous drainage :- - The superior surface of the gall bladder is drained by veins which enter the liver through the fossa for the gall bladder and join tributaries of hepatic veins - The rest of the gall bladder is drained by cystic veins
Liver directly (or) after joining veins draining the hepatic ducts and upper part of the bile duct Rarely - the cystic vein drains into the right branch of the portal vein - The lower part of the bile duct drains in to the portal vein - The gall bladder is divided into :- (1) fundus (2) the body (3) the neck - The fundus projects beyond the inferior border of the liver, in the angle between the lateral border of the right rectus abdominis and the ninth costal cartilage - No part of gall bladder is described as infundibulum, though the posteromedial wall of the neck is dilated outwards to form a pouch called Hartmanns’ s pouch, which is directed downwards and backwards. Some regard this pouch as a normal feature but other consider it as pathological, as gall stones may lodge in this pouch. 140. (b) L1 (Ref : BDC 4th/e vol. II - pg 264) ♦ The superior mesenteric artery arises from the front of the abdominal aorta, behind the body of the pancreas, at the level of vertebra L1, one centimeter below the coeliac trunk ♦ The inferior mesenteric arises from the front of the abdominal aorta behind the third part of duodenum at the level of the L3 vertebra, and 3-4 cm above the bifurcation of the aorta ♦ The coeliac trunk arises from the front of the abdominal aorta just below the aortic opening of the diaphragm at the level of the disc between vertebrae T12 and L1. It is only 1.25cm long 141. (b) I.V.C (Ref : BDC 4th/e vol. II - pg 307) Adrenal glands :- The naked eye examination of a cross section of the suprarenal gland shows an outer part
cortex (main mass) & an inner part
medulla (1/10 of gland) The cortex has three zones :- Abdomen 113 (1) Outer zona glomerulosa
mineralocorticoid (2) Middle zona fasciculata
glucocorticoids (3) Inner zona reticularis
sex hormones The medulla - chromaffin cells producing (1) Adrenaline (2) Noradrenaline - Autonomic ganglion cells are also seen Arterial supply :- Each gland - (1)The superior suprarenal artery - branch of inferior phrenic artery (2)The middle suprarenal artery - branch of abdominal aorta (3) The inferior suprarenal artery- branch of the renal artery Venous drainage : ♦ Right suprarenal vein
I.V.C ♦ Left suprarenal vein
Left renal vein. Lymphatics drain into lateral aortic nodes 142. (d) Transversus fascia (Ref : BDC 4th/e vol. II - pg 208) Inguinal canal ♦ Oblique passage - lower part of anterior abdominal wall ♦ Just above medial half of inguinal ligament ♦ Length - 4cm (1.5 inches) ♦ From - deep inguinal ring to superficial inguinal ring ♦ Deep inguinal ring - an oval opening in fascia transversalis - 1.2cm above midinguinal point - Immediately lateral to stem of inferior epigastric artery ♦ Superficial inguinal ring : triangular gap in the external oblique aponeurosis - base of triangle - pubic crest - 2.5cm long & 1.2cm broad at base 143. (b) Posterior (Ref : BDC 4th/e vol. II - pg 372) LOBES OF PROSTATE (1) Anterior lobe - Small isthmus connecting the two lateral lobes of the gland - No glandular tissue - Seldom forms adenoma (2) Posterior lobe - Connects the two lateral lobes behind the urethra - Behind the median lobe and the ejaculatory 116 Anatomy also supplies - uterine tube - side of uterus - ureter (2) The uterine artery Venous drainage :- Pampiniform plexus  Ovarian vein  (Rt) side (Lt) side I.V.C left renal vein Lymphatic drainage :- Lymphatics from the ovary communicate with the lymphatics from the uterine tube & fundus of the uterus. They ascend along the ovarian vessels to drain into the lateral aortic & pre aortic nodes. Nerve supply :- Sympathetic - T10, T11
afferent for pain
efferent / vasomotor Parasympathetic-S2,S3,S4
Vasodilator 145. (a) Ascending colon Ref : II / 258, 259 (1) Ascending colon
12.5cm long - from the caecum to the inferior surface of the right lobe of liver - usually retroperitoneal (2) Transverse colon
50cm long - from the right colic flexure to the left colic flexure - suspended by transverse mesocolon attached to the anterior border of pancreas (3) Descending colon - 25cm long - from left colic flexure to the sigmoid colon - it is narrower than ascending colon - usually it is retroperitoneal (4) Sigmoid colon
37.5cm long - from pelvic brim to the third piece of sacrum, where it becomes rectum - suspended by sigmoid mesocolon 146. (a) Inguinal nodes (Ref : BDC 4th/e vol. II - pg 382, 383) The concept of white line of Hilton & pectinate line :- The interior of the anal canal shows many important features and is divided into three parts : Abdomen 117 (1) The upper part - 15mm long (2) The middle part - 15mm (3) The lower part - 8mm (1) The upper part - mucous membrane lining - endodermal origin - 6-10 vertical folds - anal columns of morgagni - lower ends of anal column are united
tra- nsverse folds called anal valve - above each valve, a depression called anal sinus - Anal valves together form a transverse line - all around the anal canal
Pectinate line It is situated opposite the middle of internal anal sphincter, the junction of ectodermal & endodermal parts. - Occasionally anal valves show epithelial projections called - anal papillae which are remnants of the embryonic anal membrane (2) Middle part or transitional zone / pecten :- - Also lined by mucous membrane - Anal columns are absent - A dense venous plexus lies between the mucosa & muscle coat and gives it a bluish discolouration - Mucosa is less mobile and this region is referred to as pecten / Transitional zone - The lower limit of the pecten often has a whitish appearance
White line of Hilton - Hilton’s line is situated at the level of the interval between the subcutaneous part of the external anal sphincter and the lower border of internal anal sphincter. It has stratified squamous epithelium, which is thin, pale & glossy & is devoid of sweat glands. (3) Lower cutaneous part :- - True skin - Has sweat glands & sebaceous glands The lymphatic drainage :- ♦ Lymph vessel form the part above the pectinate line, drain with those of the rectum into the internal iliac nodes ♦ Vessels from the part below the pectinate line, drain into the medial group of the superficial inguinal nodes 147. (d) Arises from the mesenteric border of ileum (Ref : BDC 4th/e vol. II - pg 252) 118 Anatomy Meckel’s Diverticulum ilei) ♦ It is the persistent proximal part of the vitellointestinal duct, present in the embryo, and which normally disappears during the 6th week ♦Points of 2’s (1) It occurs in 2% subjects (2) Usually it is 2 inches or 5 cm long (3) It is situated about 2 feet (or) 60cm proximal to the ileocaecal valve, attached to antimesenteric border of the ileum (4) It’s calibre is equal to that of ileum (5) Its apex may be free or may be attached to the umbilicus, to the mesentery, or to any other abdominal structure by a fibrous band (6) It may cause intestinal obstruction (7) It may have small regions of gastric mucosa (8) Acute inflammation of the diverticulum may produce symptoms that resemble those of appendicitis (9) It may be involved in other diseases similar to those of the intestine Differences b/w Jejunum Ileum - Villi are tongue shaped - Villi are few, thin & finger like - No mucous glands or aggre- - Collection of lymphocytes in the gated lymphoid follicles are form of peyer’s patches in present in submucosa lamina propria extending into the submucosa is a characteristic feature 148. (a) CBD, Hepatic artery, Portal vein (Ref : BDC 4th/e vol. II - pg 232) Right border of lesser omentum :- ♦ It forms the anterior border of the Epiploic foramen / Foramen of winslow ♦ It contains the portal vein, the hepatic artery and the bile duct Relation of the bile duct (Ref : BDC 4th/e vol. II - pg 275) ♦ Supraduodenal parts in the free margin of lesser omentum - Anteriorly - liver - Posteriorly - Portal vein & epiploic foramen - To the left - Hepatic artery Relations of the portal vein : (Ref : BDC 4th/e vol. II - pg 269) Supraduodenal part within the free margin of the lesser omentum :- ♦ Anteriorly (a) Hepatic artery (b) Bile duct ♦ Posteriorly : Inferior vena cava, separated by epiploic foramen Abdomen 121 (2) Pectineal ligament / Cooper’s ligament :- - Extension from posterior part of the base of lacunar ligament - Attached to pecten pubis. It is thickening in the upper part of the pectineal fascia (3) The reflected part of the inguinal ligament :- - Fibres that pass upwards & medially from lateral crus of superficial inguinal ring - Lies behind the superficial inguinal ring & front of conjoint tendon - Its fibres interlace with those of the other side at linea alba 153. (b) Latissimus dorsi (Ref : BDC 4th/e vol. II - pg 297 fig 24.4) Posterior relations The posterior surfaces of both kidneys are related to the following : (1) The diaphragm (2) The medial and lateral arcuate ligaments (3) The psoas major (4) Quadratus lumborum (5) Transversus abdominis - The subcostal vessels - The subcostal, iliohypogastric and inguinal nerves - The right kidney is related to 12th rib - The left kidney is related to eleventh and twelfth rib Anterior relations : - Left kidney Right kidney - Left suprarenal gland - Right suprarenal gland - Stomach* - Liver* - Pancreas - Second part of duodenum - Splenic vessels* - Hepatic flexure of colon - Splenic flexure & descending - Small intestine* colon - Jejunum* - Lateral border of kidney is ∗ Covered by peritoneum related to the right lobe of liver and to the hepatic flexure of colon 154. (b) Splenic artery (Ref : BDC 4th/e vol. II - pg 286) Relations of body of pancreas :- It has 3 borders and 3 surfaces : ♦ Anterior border - provides attachment to transverse mesocolon ♦ Superior border - Related to - Coeliac trunk - Hepatic artery 122 Anatomy - Splenic artery to the left ♦ Interior border - Superior mesenteric vessels at its right end ♦ Anterior surface : forwards & upwards covered by peritoneum related to lesser sac & stomach ♦ Posterior surface (Bed)- devoid of peritoneum. related to: (1) Aorta with origin of superior mesenteric artery (2) Left crus of diaphragm (3) The left suprarenal gland (4) The left kidney (5) Left renal vessels (6) Splenic vein Inferior surface : Covered by peritoneum & related to (1) Duodenojejunal flexure (2) Coils of jejunum (3) Left colic flexure 155. (b) Renal fascia (Ref : Gray’s 39th/e pg 1270) Perirenal fascia :- “ The perirenal fascia is a dense, elastic connective tissue sheath which envelops each kidney and supra renal gland together with a layer of perirenal fat, which is thickest at renal borders, and prolonged at the hilum into the renal sinus. The perirenal fascia was originally described as being made up to two separate entities, the posterior fascia of zuckerkandl and anterior fascia of gerota which fused laterally into lateral conal fascia 156. (a) Anterior division of internal iliac artery (Ref : BDC 4th/e vol. II - pg 387) Internal iliac artery :- ♦ Branch of common iliac artery ♦ 3.75cm long ♦ In foetus, internal iliac artery is double the size of the external iliac artery because it transmits blood to placenta through umbilical artery ♦ After birth, the proximal part of umbilical artery persists to form the first part of superior vesical artery, and the rest of it degenerates into a fibrous cord, the medial umbilical ligaments : Anterior division Posterior division 6 branches (1) Iliolumbar (1) Superior vesical (2) Two lateral sacral (2) Obturator (3) Superior gluteal arteries Abdomen 123 (3) Middle rectal (4) Inferior vesical (5) Inferior gluteal (6) Internal pudendal In females Inferior vesical replaced by vaginal artery (7) Uterine artery 157. (d) None (Ref : Gray’s A 39th/e pg 952,953) ♦ Manubrium is level with the third & fourth thoracic vertebra ♦ The body is level with the fifth to ninth thoracic vertebra ♦ (Pg 945) - Xiphisternal joint & xiphoid process may be felt at the inferior end of the sternum. The joint usually lies at the level of the ninth thoracic vertebra ♦ The umbilicus in the supine position, lies at the level of the disc between the third & fourth lumbar vertebra. The bifurcation of aorta then lies 2cm caudal to umbilicus. In erect position, in children and in obese or individuals with pendulous abdomen, the umbilicus may lie at lower level. ♦ Aortic aperture of diaphragm
lowest & most posterior - at level of the lower border of T12 vertebra ♦ Oesophageal aperture - T10 vertebra ♦ Vena caval aperture - highest - at level of disc between T8 and T10 vertebrae 158. (a) Lt. transverse process of L2 to Rt. sacroiliac joint (Ref : BDC 4th/e vol. II - pg 227) Mesentery :- ♦ The mesentery of the small intestine (or) mesentery proper is a broad, fan-shaped fold of peritoneum which suspends the coils of jejunum and ileum from the posterior abdominal wall Root of mesentery - 15cm long - directed obliquely downwards and to the right - It extends from the duodenojejunal flexure on the left side of vertebra L2 to the upper part of the right sacroiliac joint - It crosses the following : (1) Third part of duodenum where the superior mesenteric vessels enter into it (2) The abdominal aorta (3) The inferior vena cava (4) The right ureter (5) The right psoas major The free or intestinal border is 6meter long, thrown into pleats. 126 Anatomy The fibres forming inferior hypogastric plexus :- Sympathetic Nerves (T10 to L2) ♦ Derived chiefly from hypogastric nerve ♦ A few fibres from sympathetic ganglia Parasympathetic Nerves (S2,S3,S4) ♦ Derived from pelvic splanchnic nerves ♦ They relay in walls of the viscera supplied 164. (b) Genital branch of genitofemoral nerve Innervation of cremaster muscle : (Gray’s 39th/ed pg 1109) Cremaster is innervated by the genital branch of genitofemoral nerve, derived from the first & the second lumbar spinal nerves ♦ Stroking the skin of the medial side of the thigh evokes a reflex contraction of the muscle, the cremasteric reflex most pronounced in children ♦ (Pg 371/ Snells Neuroanatomy 4th ed) This reflex arc passes through the first lumbar segment of the spinal cord ♦ This reflex is dependent on the integrity of the corticospinal tracts, which exert tonic excitatory influence on the internuncial neurons 165. (a) Left gastric artery, (b) Short gastric artery (e) Lt. gastroepiploic artery (Ref : BDC 4th/e vol. II - pg 241) This is a very important question in the context of both anatomy and surgery as well The stomach is supplied by :- (1) Left gastric artery - branch of coeliac trunk (2) The right gastric artery - branch of common hepatic artery (3) The right gastroepiploic artery - branch of gastroduodenal artery (4) The left gastro epiploic artery - branch of splenic artery (5) 5 - 7 short gastric artery - branches of splenic artery Peptic ulcer - occur at sites of pepsin and HCl, namely stomach, first part of duodenum, lower end of esophagus and Meckel’s diverticulum Duodenal ulcer - Anterior perforates and posterior bleeds because of its relation to the gastroduodenal artery 166. (d) Inferior mesenteric vein (Ref : BDC 4th/e vol. II - pg 235) Peritoneal fossae (Recesses) ♦ These are small pockets of the peritoneal cavity enclosed by small, inconstant folds of peritoneum ♦ They commonly occur at the transitional zones between the absorbed and unabsorbed parts of the mesentery Abdomen 127 ♦ These are best observed in foetuses, and are mostly obliterated in adults. Sometimes they persists to form potential sites for internal hernia and their strangulation. Classification (1) Duodenal Fossae (2)Lesser sac (3) Caecal fossae (or) Recess - (largest recess) - always present (1) Duodenal fossae :- (1) Superior duodenal recess - Present in 50% subjects - At level of L2 vertebra - 3cm deep - orifice looks downwards (2) Inferior duodenal recess - present in 75% subjects - L3 vertebra level - 3 cm deep - Orifice looks upwards (3) Paraduodenal recess :- - Present in 20% subjects - Inferior mesenteric vein lies in the free edge of the peritoneal fold - Orifice looks to the right (4) Retroduodenal recess :- - Occasionally present - Largest of duodenal recesses - 8 to 10 cm deep - Orifice looks to the left (5) Duodenojejunal / mesocolic recess :- - Present in 20% of subjects - 3cm deep - Orifice looks downwards & to the right (6) Mesentricoparietal fossa of waldeyer :- - In 1% subjects - Lies behind upper part of the mesentery - The superior mesenteric vessels lie in the fold of the peritoneum covering this fossa (3) CAECAL FOSSAE 128 Anatomy (1) Superior ileocaecal recess :- - commonly present - formed by a vascular fold present between the ileum and the ascending colon - orifice looks downwards & to left (2) Inferior ileocaecal recess :- - is covered by the fold of treves - orifice - downwards & to left (3) Retrocaecal recess :- - behind caecum - often looks downwards The Intersigmoid recess ♦ Constantly present in the foetus & early infancy ♦ May disappear with age ♦ Lies behind apex of sigmoid mesocolon ♦ Orifice looks downwards 167. (d) Synarthrosis (Ref : Gray’s 39th/e pg 952) Unlike all other steronocostal joints, the manubriocostal joint (between the manubrium and the first costal cartilage) is an unusual form of synarthrosis 168. (b) Marginal artery (d) Sigmoid artery (Ref : BDC 4th/e vol. II - pg 266, 267) Sigmoid arteries or inferior left colic arteries : ♦ 2-4 in number ♦ downward & left to anastomose with each other and to form lower part of the marginal artery ♦ upper most branch
descending branch of left colic artery ♦ lower most branch
superior rectal artery ♦ supply the descending colon in iliac fossa & sigmoid colon The marginal artery :- ♦ Described by von heller in 1803, present name given by sudeck 1907 ♦ The marginal artery is an arterial arcade situated along the concavity of the colon formed by anastomoses between the main arteries supplying the colon, namely the - ileocolic - right colic - left colic Abdomen 131 significant cases develop hypoxaemia and respiratory failure at birth. 172. (d) Pudendal nerve (Ref : BDC 4th/e vol. II - pg 383) ♦ The anal veins are arranged radially around the anal margin and they communicate with the internal rectal plexus and inferior rectal veins ♦ Excessive straining during the defecation may rupture one of these veins, forming a sub cutaneous perianal hematoma known as external piles ♦ The anal margin is below the pectinate line and the part of anal canal below pectinate line is supplied by somatic (Inferior rectal S2,S3,S4) nerves, which is one of the branches of pudendal nerves. 173. (a) Bile duct (b) Hepatic artery (d) Portal vein (Ref : Gray’s Anatomy 39th/e pg 1216) ♦ “The liver has four lobes or eight segments depending on whether it is defined by its gross anatomical appearance or by its internal architecture ♦ Classification of the liver by internal architecture divides it into lobes, segments (or) sectors ♦ The biliary, hepatic arterial and portal venous supply of he liver tend to follow very similar distributions used to define the hepatic segments ♦ The hepatic venous anatomy follows a markedly different pattern ♦ The value of the segmental classification, according to vascular and biliary supply is that surgical resection of a segment, multiple segments or a whole lobe, may be planned and performed to encounter fewest possible major vascular structures”. 174. (c) L4, L5 Nerve roots (Ref : Gray’s Anatomy 39th/e pg 751) ♦ Sacral canal is formed by sacral vertebral foramina ♦ triangular in section ♦ Each lateral wall presents 4 intervertebral foramina, through which the canal is continuous with pelvic and dorsal sacral foramina ♦ Its caudal opening is the sacral hiatus ♦ The canal contains the - cauda equina - the filum terminale - the spinal meninges ♦ The fifth sacral spinal nerves also emerge through the hiatus medial to the sacral cornua & groove the lateral aspects of the 5th sacral vertebra. 132 Anatomy ♦ (Gray’s A 39th/e pg 729) -The dural sac (theca), and thus the subarachnoid space and its contained C.S.F, (S2)usually extends to the level of the second segment of the sacrum. This corresponds to the line joining the sacral dimples located in the skin over the posterior superior iliac spines Gray - 739 Veins of the vertebral column form intricate plexuses along the entire column, external & internal to the vertebral canal 175. (a) Wolffian duct (Ref : BDC 4th/e vol. II - pg 366) Development of female reproductive system :- Comprises of (1) Two ovaries (2) Genital ducts (3) External genitalia Ovary : - Various components & their derivations :- (a) germ cells - migrated from dorsocaudal end of yolk sac (b) follicular cells - from epithelial cells of coelomic epithelium (c) stromal cells - derived from mesoderm ♦ No tunica albugenia in ovary and cortical part of gonad predomi- nates Ducts : - In female :- ♦ Mullerian (or) paramesonephric duct predominates ♦ This duct is lateral to mesonephric duct ♦ Opens caudally into definitive urogenital sinus ♦ Mullerian ducts proliferate due to presence of oestrogens and absence of testosterone and mullerian inhibiting substance ♦ Distal part of the two ducts fuse to form the single uterovaginal canal which gives rise to uterus with its fundus, body and cervix parts ♦ Wolffian duct / Mesonephric duct forms trigone of urinary bladder as functional component. Duct of gartner is its vestigeal component Epoophoron : ♦ 10-15 parallel tubules between the ovary & uterine tubes, which end in a longitudinal duct ♦ These tubules represent cranial mesonephric tubules while the duct is a remnant of mesonephric duct / wolffian duct External genitalia :- ♦ Mesenchymal cells migrate around cloacal membrane forming Abdomen 133 cloacal folds, which fuse ventrally forming genital tubercles Cloacal folds Anteriorly Posteriorly - urethral folds - Anal folds At same time Cloacal membrane Anteriorly Posteriorly - Urogenital membrane - Anal membrane ♦ Lateral to urethral folds - appear another pair of genital folds ♦ Genital tubercle forms - clitoris - urethral folds forms - labia minora - genital swelling form - labia majora - urogenital membrane gets ruptured to form the vestibule