SHEILA TERRY / SCIENCE PHOTO LIBRARY SHEILA TERRY / SCIENCE PHOTO LIBRARY
Light micrograph of a section of human skin, showing three central hair follicles. The outer layer of the skin, the epidermis, is the thin, pink band, supported by the deeper, blue, dermis. Beneath is the subcutaneous layer of connective tissue & fat. The epidermis grows down to form the lining of the hair shaft or follicle. The hair is rooted in an enlarged "hair bulb", where actively dividing cells make the hair grow. Associated with the follicle is smooth muscle, to pull the hair erect in cold or fear, & sebaceous glands that secrete oily sebum. The latter are the white globules along the follicles. Magnification: x18 at 6x7cm size. Magnification; x30 at 4x5" size.
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