Human hair. Coloured Scanning Electron Micrograph (SEM) of the surface of a shaft of human hair. The hair shaft has an outer cuticle of flat over- lapping scales or plates,as seen here,which it is thought,prevent the 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. It consists of non-living tissue. Hair growth occurs when epidermal cells divide within the root bulb. Magnification: x660 at 6x6cm size. x1000 at 4x5ins | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Scharf, David |
Bildgröße: | 3323 px × 3345 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: |
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