DR TONY BRAIN / SCIENCE PHOTO LIBRARY DR TONY BRAIN / SCIENCE PHOTO LIBRARY
Hair. Coloured scanning electron micrograph (SEM) of hair partly covered by particles (blue) of dry shampoo. Hairs consist of a root which is implanted in the dermis of the skin and a shaft which represents the portion projecting from the epidermis. The shaft is divided into three concentric sheaths called the medulla, cortex and cuticle. The cuticle, the external sheath, is seen here; it is formed by a single layer of flat keratinised scales which overlap each other. The root terminates with an enlargement, known as the bulb, which contains the hair matrix where the hair cells are produced. Magnification: x160 at 35mm size.
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