Download Anatomy of the Skin: Epidermis, Dermis, and Accessory Structures and more Quizzes Zoology in PDF only on Docsity! TERM 1 epidermis- stratum germinativum ch. 4, lab 8 DEFINITION 1 epidermis is multi-layered, and its outer layers are highly keratinized, constantly shed, and replaced by underlying layers of cells originating in the mitotically active basal stratum germinativumalso referred to as the stratum basale.these cells continuously divide and are located above the basement membrane TERM 2 epidermis- stratum corneum ch. 4, lab 8 DEFINITION 2 (Latinfor 'horned layer') is the outermost layer of theepidermis, consisting of deadcells(corneocytes) that lacknucleiandorganelles.The purpose of thestratum corneumis to form a barrier to protect underlying tissue frominfection,dehydration, chemicals and mechanical stress.they are dead, keratin-filled cells. TERM 3 dermis ch. 4, lab 8 DEFINITION 3 The dermis is a layer of skin between the epidermis and subcutaneous tissues, that consists of connective tissue and cushions the body from stress and strain. thicker than the epidermis. TERM 4 chromatophores DEFINITION 4 Chromatophores are pigment-containing and light-reflecting organelles.derived from neural crest cells.found in skin, feathers and functions as camouflage, warning, courtship, and sex identification.*no pic in lab manual- find pic to identify. TERM 5 hair DEFINITION 5 mammalian synapomorphyoriginates in epidermis but anchored in dermis.tufts of coarse hairs known as vibrissae- functions as mechanoreception (think whiskers) protection, filtration, warding off insects and social displays. TERM 6 scales DEFINITION 6 reptillian scales play a critical role in mechanical and osmotic protectionin snakes, ventral scales or scutes play a part in locomotion.pic p. 30 TERM 7 feathers ch.4 lab 8 DEFINITION 7 function- debate btw different functions- some say flight, another that feathers evolved parallel to the evolution of enothermism within birds, and another holds that feathers may have evolved to facilitate social behavior such as courtship and nesting. TERM 8 claws ch. 4 lab 8 DEFINITION 8 fuction- traction and locomotion, food gathering, self defense, and digging.pic p. 31 TERM 9 horns, antlers and other derivatives ch.4, lab 8 DEFINITION 9 keratinized sheath makes up hornssee pic. page 32 TERM 10 glands ch. 4 lab 8 DEFINITION 10 -many produc mucous-very important in amphibians as their skin must remain moist to act as a respiratory organ.-
