NSG 2317 Chapter Notes - Chapter 4: Stratum Corneum, Stratum Basale, Adipose Tissue
12 Mar 2018
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Document Summary
Inner stratum germinativum (basal cell layer) forms new skin cells: main ingredient: keratin (melanocytes on this layer produce melanin, everyone has the same # of melanocytes depends on how much melanin is produced) Stratum corneum (outer layer) made of dead keratinized cells (interwoven: constantly being shed (desquamated) Skin colour comes from 3 sources: brown pigment melanin (main); yellow-orange tones of carotene; red-purple tones in underlying vascular bed; : inner supportive layer consisting mostly of collagen (ct) resists tearing. Has elastic tissue to allow the skin to stretch. Nerves, sensory receptors, blood vessels, lymphatic vessels, hair follicles, sebaceous glands, and sweat glands lie here. Adipose tissue (lobules of fat cells) for temp. control, protection, and increased mobility over structures underneath. Vestigial: no longer needed for protection from cold or trauma. Shaft is visible, root is below the surface, bulb is where new cells are produced. Vellus hair = covers most of the body.
