Shoulder Joint Anatomy: Surfaces, Ligaments, Bursa, Movements, and Stabilizers, Assignments of Nationality law

Download Shoulder Joint Anatomy: Surfaces, Ligaments, Bursa, Movements, and Stabilizers and more Assignments Nationality law in PDF only on Docsity! Shoulder joint Ligaments 1.Capsular ligament & Synovial membrane 2.Glenohumeral ligament 3.Coracohumeral ligament 4.Transverse humeral ligament Accessory ligaments: Coracoacromial ligament  Coracoacromial arch Capsular ligaments Attachments: Medially – Attached to glenoid cavity & labrum, extends above to supraglenoid tubercle Laterally – Attached to Anatomical neck of humerus & extend downwards till surgical neck of humerus for up to 1.5 cm Inferiorly – No attachment of capsule MedialLateral Synovial membrane • Lines the inner surface of capsule and reflects from it to the glenoid labrum and humerus, thus forms the synovial cavity • Extends as tubular sheath to enclose long head of biceps brachii tendon • It communicates with Subscapular and Infraspinatus bursae around the joint Coracoacromial ligament • Ligament that extend between coracoid process to acromion process Coracoacromial arch • It is formed by coracoid process, acromion process, and coracoacromial ligament between them • It protects the head of humerus from above and prevents superior displacement of the shoulder • Relations:  Supraspinatus muscle passes under this arch  Subacromial bursa lies between acromion process superiorly and tendon of supraspinatus inferiorly Subacromial Bursae • Subscapular bursa – lies b/w subscapularis and neck of scapula • Subacromial bursa/Subdeltoid bursa – largest synovial bursa in the body. It lies b/w acromion process above and supraspinatus tendon below • Infraspinatus bursa – lies b/w infraspinatus and posterolateral aspect of joint capsule Arterial supply • Anterior circumflex humeral artery • Posterior circumflex humeral artery • Subscapular artery • Suprascapular artery branch of Subclavian artery Branch of 3rd part of axillary artery Nerve supply • Suprascapular nerve –branch from upper trunk of brachial plexus • Axillary nerve – branch from posterior cord •Musculocutaneous nerve – branch from lateral cord Movement •Movement take place in all axis  At transverse axis – Flexion & Extension  At vertical axis – Medial & Lateral rotation  At anteroposterior axis – Adduction & Abduction  Combination of all movements - Circumduction Rotator cuff / Humerus Subscapularis Infraspinatus Teres minor  Other factors • Coracoacromial arch – Secondary socket of shoulder joint. This arch prevent upward dislocation of shoulder • Long head of Triceps • Glenoid labrum – made of fibrocartilaginous ring which deepens the glenoid cavity Posterior Dislocation ‘ . Anterior Dislocation _ MR ssisx.com Clinically, patient present as • Hollowing in the shoulder contour • Prominence of shoulder tip Frozen shoulder (Adhesive capsulitis) • Occur due to shrinkage of joint capsule as the age advances • Commonly seen in age group of 40-60 years • Patient complaints of pain and limitation of movements • No radiological changes Summary • Type of joint • Articulating surfaces • Ligaments • Bursa • Blood and Nerve supply •Movements • Factors maintaining Upper end humerus Clavicle Acromion process Glenoid cavity Coracoid process Anterior shoulder dislocation Inferior shoulder dislocation Posterior shoulder dislocation