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26 Cards in this Set
- Front
- Back
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skin function (4)
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protection - sense - vitamin D w/UV - temp regulation
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skin regulates body temperature by ____ or ____ of blood vessels and ____ glands
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dilation - constriction - sweat
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3 regions of the skin
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epidermis - dermis - hypodermis
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epidermis description (2)
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avascular - protect outer epithelial layer
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dermis description (3)
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vascular - tough fibrous CT layer - largest region of skin
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hypodermis (subcutaneous) is ____ to the dermis, has ____ & ____ CT & anchors the____
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deep - adipose - areolar - skin
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epidermis have what tissue type
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keratinized, stratified squamous ET
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epidermis has ____ layers in thick skin. Regular skin has ____.
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five - 4
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deepest layer - attached to dermis - 1 layer of cuboidal keratinocytes - mitotic layer - contain melanocytes - contains merkel discs
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stratum basale (germinativum)
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melanocytes function
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produce the pigments melanin
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merkel's disc detect ____ & have ____ nerve endings
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pressure - sensory
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several layers of keratinocytes - scattered melanin granules - langerhan cells = macrophages
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stratum spinosum
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thin region of dark stained cells - flat cells keratohyaline granules - cells above are dead
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stratum granulosum
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thin, translucent layer of dead keratinocytes present in thick skin
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stratum lucidum
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outer loose layer of dead flaky cells - protects skin from abrasion + penetration
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stratum corneum
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keratinocytes description (3)
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most numerous cell type - produce protein keratin - replaced every 25-45 days
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keratin is used for ____ & ____
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waterproofing and protection
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what is a thick flexible CT layer, rich in nerve fibers & very vascular
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the dermis
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2 major layers of the dermis
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papillary - reticular
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papillary layer description (3)
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loosely woven - highly vascular - larger dermal folds form ridges for fingerprints
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papillary layer contains (3)
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dermal papillae - meissners corpuscles - free nerve endings
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meissners corpuscles detect
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touch
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free nerve endings detect
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pain
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reticular layer makes up ____% of dermis
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eighty
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reticular layer description (2)
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dense irregular CT - rich in collagen
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reticular layer contains (4)
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hair follicles - sebaceous glands - blood vessels + nerves - pacinian corpuscles in deep regions
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