Skin, The largest single organ in the body, forming a protective covering over it. The skin of an adult person weighs about six pounds and if spread flat would cover an area of about 16 to 20 square feet. The skin consists of specialized cells call epithelial cells, of elastic fibers, and of numerous blood vessels called capillaries, nerves, and nerve endings, sweat and sebaceous glands, and hair follicles. There are three generalized layer of the skin: the epidermis (the outermost layer), the dermis (true skin), and the subdermis (the deepest layer of the skin).
PubMed:http://www.ncbi.nlm.nih.gov/pubmed/24653556
Sources: Fishbein, Morris. The New Illustrated Medical and Health Encyclopedia.
New York: H. S. Stuttman, 1970. Print.
New York: H. S. Stuttman, 1970. Print.