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9 Cards in this Set
- Front
- Back
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Layers of Epidermis (superficial to deep) |
Stratum Corneum Stratum Lucidum Stratum Granulosum Stratum Spinosum Stratum Basale |
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Stratum Corneum |
- Dead skin cells with no nucleus - Packed and cemented together to form semi-impermeable barrier |
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Stratum Lucidum |
Composed of: - 3-5 layers of flattened keratinocytes |
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Stratum Granulosum / Granular Layer |
Contains granules (breakdown of keratinocytes) |
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Stratum Basale / Basal Layer |
Contains: - Dividing keratinocytes (stem cells) - Melanocytes |
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Dermis |
Connective tissue - collagen (70%) - Elastic fibers - Ground substance Blood Vessels Nerves - Free nerve endings - touch, pain, temperature - Meissner's (touch) and Pacinian (pressure) corpuscles Cells - Fibroblast, macrophages, and mast cells |
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Skin Appendages |
Eccrine sweat glands - open onto surface Apocrine sweat glands - Axilla and angogenital areas - Apocrine sweat + bacterial degradation = body odor Sebaceous Glands - produce sebum, associated with hair follicles Hair - terminal hair: thick long hair, e.g., head, pubic, beard, axilla - Lanugo Hair: fine hair on newborns - Vellus hair: fine, short hairs on adult body Nails - Made of keratin - Fingernails grow 2x fast as toe nails |
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Integumentary system |
Skin + accessory structures of hair, nails and glands |
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Skin |
- Largest organ in the body - 16%-20% of body's weight |
