BSIP ESTIOT / SCIENCE PHOTO LIBRARY BSIP ESTIOT / SCIENCE PHOTO LIBRARY
Skin. Artwork of a cross-section through human skin. The skin is a protective layer that keeps the inner organs of the body free from infection. It is made up of several layers. The uppermost is the epidermis (red, upper centre) which is tough, and covered in a dead layer of skin cells. Below that is the dermis (orange), which contains the sebaceous glands (blue, centre left) which release sweat, and hair follicles (grey, lower right) from which hairs grow. Below the dermis is the subcutaneous tissue, containing fat cells (yellow), nerve cells which reach to the epidermis and give the sense of touch, and capillaries (red, purple, bottom) which provide the skin with blood.
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