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15 Cards in this Set
- Front
- Back
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Skin Functions
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• Cushions and insulates deeper organs
• Protects body from bumps, scrapes, and cuts • Protects body from chemicals, heat, and cold |
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Layers of Epidermis
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Stratum basale (stratum geminativum)
Stratum spinosum Stratum granulosum Stratum lucidum (only in thick skin) Stratum corneum |
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Layers of Dermis
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•Papillary layer – includes dermal papillae
•Reticular layer – deeper layer – 80% of thickness of dermis |
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Keratinocytes
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• Keratinocytes – most abundant cell type in epidermis
• Arise from deepest layer of epidermis • Produce keratin – a tough fibrous protein • Produce antibodies and enzymes • Keratinocytes are dead at skin's surface |
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Pigments
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• Melanin – most important pigment – made from tyrosine
• Carotene – yellowish pigment from carrots and tomatoes • Hemoglobin – Caucasian skin contains little melanin • Allows crimson color of blood to show through |
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Sebaceous Glands
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Sebaceous Glands
•Occur over entire body, except palms and soles •Secrete sebum – an oily substance •Simple alveolar glands •Holocrine secretion – entire cell breaks up to form secretion •Most are associated with a hair follicle •Functions of sebum • Collects dirt; softens and lubricates hair and skin |
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Two types of sweat gland
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Eccrine gland
•Most numerous – produce true sweat Apocrine gland •Confined to axillary, anal, and genital areas •Produce a special kind of sweat |
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Thick vs Thin skin
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•Stratum lucidum layer
(only in thick skin) |
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Tissues of Dermis & epidermis develpo from
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•Epidermis develops from embryonic ectoderm
•Dermis and hypodermis develop from mesoderm |
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