Caption: Human hair shafts from the head. 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*: X6
Type: SEM
Copyright 2008 Dennis Kunkel Microscopy, Inc.
Keywords: 05.01.08,28204G,cuticle,hair shaft,hair shafts,human body,human hair,human hairs,keratin,keratin hair,keratinized,hair scale,scale,fibrous protein,cortex,hair cortex,hair cuticle,hair medulla,medulla,outer cuticle,outer hair cuticle,keratin scale,healthy hair,normal hair,overlapping scales,scales,nonliving tissue,red hair,hair bulb,hair root,non-living tissue,SEM,hair growth