IV4 - A. Shaft - projects above surface of epidermis 1....

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IV. Structure of the Dermis (connective tissue) A. Overall Features 1. thick in some areas, thinner in others 2. contains blood supply, nerves, glands, hair follicle B. Papillary Layer (Region) 1. loose connective tissue - much "elastin" 2. dermal papillae cause ridges in the epidermis above 3. Meissner's corpuscles - sense organ for touch 4. small capillaries supply O + nutrients C. Reticular Layer (Region) 1. dense, irregular connective tissue "collagen" 2. collagen fibers interlace in net-like fashion 3. contains: adipose, hair follicle, nerves, glands 4. subcutaneous layer attaches skin to tissue below a. Paccinian corpuscles - sense pressure change V. Hair (pili)
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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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IV4 - A. Shaft - projects above surface of epidermis 1....

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