Skip to Main Content

We have a new app!

Take the Access library with you wherever you go—easy access to books, videos, images, podcasts, personalized features, and more.

Download the Access App here: iOS and Android



The most superficial, and thinnest, layer of skin is the epidermis, which lies on top of the dermis. The dermis is thicker than the epidermis and contains many glands and nerve endings. Below the dermis is subcutaneous tissue, which is the thickest layer and is composed primarily of fat. Collectively, the skin functions to provide protection from the outside world, regulate temperature, provide tactile input, absorb ultraviolet radiation, and metabolize vitamin D. Skin is also a major component of appearance.

TABLE 7.1Types of Cells and Location in Skin

Wound Healing

TABLE 7.2Stages of Wound Healing

Pop-up div Successfully Displayed

This div only appears when the trigger link is hovered over. Otherwise it is hidden from view.