Skin Anatomy

Abstract

The skin, the largest human organ, has unique characteristics. This organ has two layers of tissues: a keratinized epidermis and a thick underlying layer of collagen-rich connective tissue that supports and nourishes the overlying epidermis. The skin is the body’s first defense against challenges from the external environment. It performs many other vital functions, such as protecting the body against external physical, chemical and biological invaders, as well as preventing the loss of excess water from the body and playing a role in regulating heat. Rampant cell proliferation is observed in the epithelial tissue because it is constantly exposed to physical and chemical insults. This chapter examines the anatomical structures of specialized skin layers and their structural and functional appendages.