Chapter06SkinItsAppendages - Skin Its Appendages I II...

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Skin & Its Appendages I. Introduction A. The skin (integumentary) is the largest organ in the body 1. Makes up about 7% of adults’ weight 2. Covers about 15 to 20 square feet 3. Complex organ (integrated functioning) 4. Maintains stable internal environment called homeostasis II. The skin A. Major functions 1. Protection & defense 2. Sensation 3. Water balance 4. Temperature regulation B. Tissue structure 1. Outer, thinner called epidermis a) Consists of 5 layers (strata) (1) Innermost-basal stratum (2) Outermost-cornified stratum 2. Thicker, inner called dermis a) Contains abundant fibers, fibroblasts & blood vessels b) Melanocytes are found here, produce melanin which protects DNA from UVL c) Papillae helps anchor epidermis to dermis 3. Hypodermis is beneath the dermis (subcutaneous) a) Anchors skin to underlying tissue (1) Insulation (2) Cushions b) Adipose cells are abundant, about half the body’s fat is stored here c) Clinically important: site for injections C. Skin colors 1.
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  • Fall '14
  • EricDavis
  • hypodermis, Eccrine glands decrease, dermis decrease, human scent glands

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