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Unformatted text preview: 6 eg. wavy hair is oval eg. tightly curly hair is relatively flat 2. Nails scale-like modification of the epidermis fingernails and toenails are clear,hard derivatives of stratum corneum very thin, dead, scaly cells, densely packed together corresponds to hoof or claw of animals most mammals have claws, flat nails are a primate characteristic more fleshy and sensitive fingertips still can be used for digging and picking apart food, etc features: nail matrix: growth zone beneath proximal skin nail bed composed of stratum basale nail plate: visible portion of nail fingernails grow ~1 mm/wk; toenails more slowly [adding gelatin to diet has no effect on growth or hardness of nails] appearance of nails has diagnostic value: eg. spoonlike, flat, concave may indicate iron deficiency eg. clubbed or swollen fingertips long term hypoxemia from eg congenital heart defects and emphysema...
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