SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Light micrograph of a human hair showing the root or hair bulb. 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 bulb 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 and oily substance called sebum, which coats the surface of the hair towards the upper part of the follicle. Magnifciation: x16 at 35mm size.
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