THIERRY BERROD, MONA LISA PRODUCTION / SCIENCE PHOTO LIBRARY THIERRY BERROD, MONA LISA PRODUCTION / SCIENCE PHOTO LIBRARY
Human skin. Computer artwork of a cross section through human skin. The upper surface (top), the stratum corneum, is formed of dead and flattened skin cells. As skin cells are sloughed off, more are produced from the epidermis (purple) beneath. Beneath this is the dermis, which contains blood vessels (yellow, blue, red), hair follicles (not seen) and sweat glands (not seen). Underneath the dermis is the subcutaneous layer, which is formed of cells called adipocytes that are filled with fat droplets (yellow). Collectively these cells are known as adipose tissue. It helps to cushion the skin and provide protection against cold.
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