Flashcards in Skin Deck (12)
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1
Epidermis Layers
Stratum corneum (flattened keratinocytes- barrier), lucidum - thick hairless skin. granulosum- keratinocytes die. spinosum connected. basale = stem cells prolif of keratinocytes and melanocytes.
2
langerhan cells
specialized macrophages w/in stratum spinosum that present antigens to t cells to activate immune system
3
Dermis layers
papillary layer = loose ct. reticular layer- sweat glands, blood vessels and hair follicles.
4
Merkel cells (discs)
sensory at epidermal dermal junction. connected to sensory neurons and presonsible for deep pressure and texture sensation.
5
free nerve endings
pain
6
meissners corpuscles
light touch
7
ruffini endigs
stretch
8
pascinian corpuscle
deep pressure and vibration
9
hypodermis
fat and connective tissue
10
Thermoregulation
sweating, controlled by ANS. postganglionic sympathetic neurons utilize ach innervate sweat glands and promote water secretion with certain ions onto skin. Heat is absorbed by body as molecules w/in H2o undergo a phase change to evaporate. vasodilation occurs to maximize heat loss.
11
arrector pili
contract in cold traps layer of heated air in skin. arterioles that feed skin capillaries constrict.
12
