LEONARD E. MORGAN, CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY LEONARD E. MORGAN, CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY
Hair structure. Artwork showing the structure of a human hair. Hairs are thread-like structures embedded in the skin and composed of dead cells containing keratin. The outermost layer of overlapping scales (brown) is the cuticle. The scales are thought to help prevent the hair from matting. Inside the cuticle is the cortex (lighter brown), which is composed of long, thin fibres. At the very centre of the hair is the medulla (black), a spongy, semi-hollow core.
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