Human hair dandruff,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 fibrous protein called keratin.Internally hair shaft is divided into three concentric sheaths (layers) called medulla,cortex outer cuticle.Hair is non-living tissue.Hair grows from hair root (bulb) embedded in skin.Hair growth occurs when epidermal cells divide at base of root bulb.Hair is non-living tissue.Magnification: x115 when shortest axis printed at 25 millimetres.

- Image ID: HJ0B63
Human hair dandruff,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 fibrous protein called keratin.Internally hair shaft is divided into three concentric sheaths (layers) called medulla,cortex outer cuticle.Hair is non-living tissue.Hair grows from hair root (bulb) embedded in skin.Hair growth occurs when epidermal cells divide at base of root bulb.Hair is non-living tissue.Magnification: x115 when shortest axis printed at 25 millimetres.
Science Photo Library / Alamy Stock Photo
Image ID: HJ0B63