1. Copyright © 2006 Thomson Delmar Learning Chapter 10 Skin Deep The Integumentary System

2. Copyright 2006 by Thomson Delmar Learning Functions of the Integumentary System The integumentary system consists of skin and its appendages –Appendages include glands, hair, fur, wool, feathers, scales, claws, beaks, horns, hooves, and nails Skin plays a role in protecting animals from infection, waterproofs the body, prevents fluid loss, provides species- specific coloration, and provides a site for vitamin D synthesis

3. Copyright 2006 by Thomson Delmar Learning Skin Skin covers the external surfaces of the body and is composed of epithelial tissue –The combining forms for skin are cutane/o, derm/o, and dermat/o –The suffix –derma also means skin Skin is made up of three layers: –epidermis –dermis –subcutaneous layer

4. Copyright 2006 by Thomson Delmar Learning Skin Layers Epidermis –most superficial layer Dermis –middle layer that contains blood and lymph vessels, nerve fibers, and accessory organs Subcutaneous layer –deepest layer that contains connective tissue

5. Copyright 2006 by Thomson Delmar Learning Glands Skin glands may be either sebaceous or sweat glands –Sebaceous glands secrete an oily sub- stance called sebum seb/o means oil –Sweat glands secrete sweat also called sudoriferous glands

6. Copyright 2006 by Thomson Delmar Learning Glands Hair is rodlike fibers made of dead protein cells filled with keratin –Combining forms for hair are pil/i, pil/o, and trich/o –Hair follicles are sacs that hold the hair fibers

7. Copyright 2006 by Thomson Delmar Learning Nails, Claws, and Hooves The distal phalanx of animals is covered by nails, claws, or hooves –Nails and claws are keratin plates in dogs and cats Combining form is onych/o –Hooves are the horny covering of the distal phalanx in ungulates like horses, ruminants, and swine

8. Copyright 2006 by Thomson Delmar Learning Pads Pads are thick areas of keratinized epithelium –Dogs and cats have digital pads and metacarpal and metatarsal pads Livestock have walls, soles, and bulbs

9. Copyright 2006 by Thomson Delmar Learning Medical Terms for the Integumentary System Additional terms for integumentary system tests, pathology, and procedures can be found in the text Review the Flash! CD program to make sure you understand these terms