False colour scanning electron micrograph (SEM) of a number of strands of normal human hair. Hair is a fibrous protein (keratin), which develops out of a tubular hair follicle found in the epidermis of the skin. The shaft, the part visible, consists of three layers; an outer layer or cuticle, which appears scaly in normal hair. Beneath is the cortex containing hair colour pigments. The medulla forms the central core, which may be hollow. Hair cells are dead except for a layer at the base of the root, which divides to form new cells, pushing the older ones upward. Magnification: X 400 at 6x7cm size & X57 at 35mm size.
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