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Nicole mcat > Skin > Flashcards

Flashcards in Skin Deck (12):
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

white vs brown fat

white fat insulates, brown fat is in infants less efficient etc and more heat released as fuel is burned