copyright © 2006 thomson delmar learning chapter 10 skin deep the integumentary system
TRANSCRIPT
Copyright © 2006 Thomson Delmar Learning
Chapter 10
Skin Deep
The Integumentary System
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
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
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
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
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
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
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
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