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Unformatted text preview: A. Shaft - projects above surface of epidermis 1. medulla - polyhedral cells with eleidin 2. cortex - elongated cells with/out pigment 3. cuticle - outermost layer, like shingles on roof B. Root - below epidermis, penetrates into the dermis C. Hair Follicle - at the base a single hair 1. external root sheath - basale and spinosum extension 2. internal root sheath - internal hair cell layers 3. bulb - base of hair cell 4. papilla - in the bulb, provides nourishment for hair 5. matrix - origin of new hair cells D. arrector pili - smooth muscle, cause hair to rise E. hair root plexuses - nerve bundle responds to touch...
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- Fall '10