Human hair, SEM

Numéro d’image : 12310258
Human hair, SEM
Human hair (Caucasian, brunette), coloured scanning electron micrograph (SEM). The outer layer of hair (the cuticle) has overlapping scales of keratin. These scales are thought to prevent hairs from matting together. Hair is made up of a fibrous protein called keratin. Internally the hair shaft is divided into three concentric sheaths (layers) called the medulla, cortex and outer cuticle. Hair is non-living tissue. Hair grows from a hair root (bulb) embedded in the skin. Hair growth occurs when epidermal cells divide at the base of the root bulb. Hair is non-living tissue. Magnification: x170 when shortest axis printed at 25 millimetres.
Licence : Libre de droits
Crédit: Science Photo Library / DENNIS KUNKEL MICROSCOPY
Model Release : Non requis
Property Release : Non requis
Restrictions : -

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