integumentaryreview - bio 230 human anatomydr. carla ......overviewofepidermis •strafied+...
TRANSCRIPT
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Integumentary Review
Bio 230 Carla Sweet M.D.
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AKA statum basale
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AKA Sub Q layer
(aka Meissner’s corpuscle)
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(aka lamellated corpuscle)
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______________Meissner’s corpuscle (aka tacHle corpuscle) Touch sensaHon
________________Pacinian Corpuscle (aka lamellated corpuscle) Pressure sensaHon
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Overview of Epidermis •Kera2nized Stra2fied Squamous epithelium•Contains no blood vessels•
Papillary layer of Dermis Areolar C.T.
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loose areolar C.T.
dense irregular C.T.
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(Dense Irregular C.T.)
Areolar C.T.
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Overview of Epidermis •StraHfied squamous epithelium •Contains no blood vessels •4 types of cells •4-‐5 disHnct strata (layers) of cells. (S. lucidum only found in thick skin)
California (corneum) Ladies (lucidum) Give (granulosum) Superb (spinosum) Backrubs (basale)
Cell types of the Epidermis • Kera2nocytes-‐-‐90% produce keraHn • Melanocytes-‐-‐-‐-‐-‐8 %produce melanin pigment •Langerhans (Epidermal dendri2c) cells-‐-‐-‐-‐-‐ provide immunity/defense •Merkel (tac2le) cells -‐deepest layer –receptor for touch.
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s. corneum
S. lucidum (found only in thick skin)
S. granulosum-‐a thin layer
S. spinosum-‐ “spiny layer”
S, Basale-‐one cell thick. Melanin granuales most concentrated here.
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aka s. basale
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(basale)
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Can you name all 5 layers?
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APO-‐think Axillary:Pubic:Odorous
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Apocrine Sweat Gland-‐-‐-‐Axillary & pubic areas release into hair follicles. Cloudy secreHons, puberty onset ?phermones?
Merocrine AKA eccrine Sweat Gland more numerous, clear secreHons, typical sweat glands for cooling
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Hair Shac (cuHcle)
Normal
SPLIT ENDS Here the cuHcle is damaged and the fibers of the cortex exposed. Remember the cortex composed of strands of keraHn which gives it elasHcity & curl
layers (outer to inside) cuHcle cortex medulla
HAIR SHAFT