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324Lecture14 skin and teeth - Integumentary System Skin...

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Integumentary System Skin
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Integument Important organ; represents 15% of total body weight. Functions: a) protection (mechanical barrier) b) detective organ (receptors) c) antiseptic barrier (chemical barrier) d) thermoregulation e) secretion and absorption f) Vitamin D synthesis
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Integument Two Layers: a) epidermis (ectodermal) b) dermis (mesodermal) Hypodermis - below dermis, attaches skin to body; not part of the skin.
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Integument Boundary between epidermis and dermis marked by prominent papillations = dermal papilla. These folds manifest themselves on the surface of the skin, especially in thick skin = finger prints, etc. Palmar and Plantar surfaces
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Integument Epidermis: most cells from superficial ectoderm (keratinocytes). Pigment cells in basal layer from neural ectoderm (melanocytes). Pigment cells form melanin. Skin color due to: a) carotene - yellow pigment in all cells b) blood vessels in underlying dermis c) melanin pigment in melanocytes at basal layer of epidermis .
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Integument Epidermal cells undergo keratinization as they move from the basal surface to the free surface; keratin or its intermediate protein replaces cell cytoplasm causing cell death. Cells become progressively flattened as they move to the surface.
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