J.C. REVY, ISM / SCIENCE PHOTO LIBRARY J.C. REVY, ISM / SCIENCE PHOTO LIBRARY
Light micrograph of a longitudinal section of human scalp showing a single hair shaft (yellow colour). Hair is a fibrous protein (keratin), which develops out of a tubular follicle located in the epidermis of the skin. Hair cells are dead except for a region within the hair or root bulb, at the base of the shaft, where epithelial cells divide to form new cells, pushing the older ones outward. One or more sebaceous glands are associated with each hair follicle; these glands secrete an oily substance called sebum, which coats the surface of the hair towards the upper part of the follicle. Magnification: x50 at 35mm size.
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