Term
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Definition
| outermost superficial region |
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Term
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Definition
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Term
| Hypodermis (superficial fasia) |
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Definition
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Term
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Definition
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Term
| Composed of keratinized stratified squamous Epithelium |
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Definition
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Term
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Definition
| produce the brown pigment melanin |
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Term
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Definition
| function as touch receptors in association with sensory nerve endings |
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Term
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Definition
| epidermal macrophages that help activate the immune system |
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Term
Layers of the Epidermis::
Stratum Basale (Basal Layer) |
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Definition
Deepest epidermal layer....
firmly attached to the dermis...
single row of the youngest keratinocytes....
cells undergo rapid division |
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Term
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Definition
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Term
Layers of the Epidermis::
Stratum Spinosum( Prickly Layer) |
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Definition
cells contain a weblike system of intermediate filaments attached to desmosomes.....
Melanin granuales and langerhans cells are abundant in this layer |
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Term
| Stratum Granulosum ( Granular Layer) |
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Definition
thin layer...
three to five cell layers |
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Term
| Stratum Lucidum (Clear Layer) |
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Definition
thin, transparent band...
superficial to the stratum granulosum....
consists of a few rows of flat, dead keratinocytes...
present only in thick skin (souls of feet) |
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Term
| Stratum Corneum (Horny Layer) |
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Definition
outermost layer of keratinized cells...
accounts for three quarters of the epidermal thickness.....
Functions include::::
waterproofing....protection from abrasion and penetration..rendering the body relatively insensitive to biological,chemical,and physical assaults. |
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Term
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Definition
| second major skin region containing strong, flexible connective tissue |
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Term
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Definition
| fibroblasts...macrophages...mast cells...white blood cells |
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Term
| Dermis is composed of what two layers? |
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Definition
| papillary (projections) and Reticular (network or branchlike) |
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Term
| areolar connective tissue |
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Definition
| part of the papillary layer with collagen and elastic fibers |
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Term
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Definition
| projections on superior surface of the papillary layer |
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Term
| dermal papillae contain.. |
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Definition
| capillary loops...meissners corpuscles...free nerve endings |
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Term
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Definition
| accounts for approximately 80% of the thickness of the skin...collagen fibers add strength and resilency...elastin fibers provide stretch - recoil properties |
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Term
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Definition
subcutaneous layer deep to the skin...
composed of adipose and areolar connective tissue |
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