4 Bio2401 Skin

4 Bio2401 Skin - – Reticular layer (dense irregular):...

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Integumentary System (Skin)
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Integumentary System Structure: Epidermis: Stratum corneum: dead cells, mostly keratin. Stratum lucidum: dead keratyoncytes; not present in all the skin. Stratum granulosum: Lamelated granules (waterproofing) Keratohyaline granules. Stratum spinosum: prekeratin. Stratum basale Dermis Papilar layer Reticular layer Function Protection Insulation Chemical damage Bacterial invasion Dehydration Temperature regulation Secretory Urea, salts, water Synthesis of vitamin D Sensory
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Figure 5.1
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Cells in the Epidermis Keratynocytes Produce keratin Melanocytes Produce melanin pigment Langerham’s cells Immunity Merkel cells Touch receptors
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Cells in the Dermis Meissner’s corpuscles Papillary layer (areolar conective tissue): pain and touch receptor. Paccinian corpuscles
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Unformatted text preview: – Reticular layer (dense irregular): pressure receptor. Figure 5.2 • " C her L ikes G etting S kin B otoxed" (from superficial to deep) • " B efore S igning, G et L egal C ounsel" (from deep to superficial) • " B efore S ex G et L atex C ondoms (from deep to superficial) Figure 4.37 Accesory organs of the skin • Nails • Hair – Hair – Follicle – Arrector pilli muscle • Cutaneous glands – Sebaceous: skin moisture. – Sweat • Ecrine (merocrine sweat glands) temperature regulation through perspiration. Appocrine:axillary and genital area (fats, water, salts, urea): pheromones? Figure 5.6 Nails Figure 5.4 Figure 5.5a, b Hair (transverse view) Figure 5.5c, d Hair follicle (longitudinal view) Figure 5.3 Figure 5.3a Figure 5.3b Sweat gland...
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This note was uploaded on 01/06/2012 for the course BIO 2401 taught by Professor Joselchou during the Spring '11 term at Collins.

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4 Bio2401 Skin - – Reticular layer (dense irregular):...

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