SEM of normal human head hair

SEM of normal human head hair

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Credit: DR TONY BRAIN/SCIENCE PHOTO LIBRARY

Caption: Flase colour scanning electron micrograph of normal human head hair. Hair is a fibrous protein (keratin), which develops out of a tubular hair follicle in the epidermis of the skin. The shaft, the part visible, consists of three layers: an outer layer or cuticle, which is 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 where they divide to form new cells, pushing the older ones upward. Magnification: X 125 at 35mm size.

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Keywords: anatomy, hair, human body

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