SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY
Human skin. Coloured scanning electron micrograph (SEM) of the epidermis, the outermost layer of human skin. The outer layer of the epidermis (the stratum corneum) is a tough coating formed from overlapping layers of dead skin cells, which are continually sloughed off and replaced with cells from the dividing layers beneath. The skin is the largest organ in the body. It protects the body from infection and dehydration, and assists in the regulation of body temperature.
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