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Definition
| consists of skin, sweat glands, oil glands, hair, nails |
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Definition
| outermost superficial region (epithelial tissue) |
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Definition
| middle region (connective tissue) |
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Definition
| deepest region (connective tissue) |
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Term
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Definition
| composed of three cell types: keratinocytes, melanocytes, and langerhan's cells |
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Term
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Definition
| most common cells; mitotic in deepest layer; produce keratin |
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Term
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Definition
| connected by desmosomes; dead and hardened with keratin at free surface |
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Term
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Definition
deepest layer; synthesize pigment- melanin
melanin is taken up by keratinocytes; accumulates on surface of nucleus to protect DNA from UV radiation of sun |
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Term
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Definition
| phagocytes (destroys foreign invaders of epidermis) |
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Term
| Stratified Epithelial Tissue |
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Definition
| functions in protection (found in areas of abrasion) |
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Term
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Definition
| capillaries of dermis supply nutrients and o2; removes wastes |
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Definition
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Term
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Definition
ranges in color and intensity: yellow, reddish-brown, black pigment
amount and kind produced determines skin color |
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Term
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Definition
yellow to orange pigment
accumulates in stratum corneum
most obvious in palms and soles of feet |
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Term
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Definition
reddish pigment found in blood-blood vessel distribution
dilation of blood vessel increases flow
responsible for pinkish hue of skin |
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Term
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Definition
thin, superficial layer, deep to stratum basale
areolar connective tissue (collagen and elastic fibers)
superior suface contains projections |
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Term
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Definition
| pushes up epidermis into ridges forming fingerprints |
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Term
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Definition
majority of thickness of skin
dense irregular connective tissue |
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Term
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Definition
layer deep to the skin
composed of adipose tissue |
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Term
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Definition
connects skin to underlying muscle
shock absorber, insulation, store fat for energy |
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Term
sudoiferous sweat glands
eccrine and apocrine |
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Definition
located everywhere except for nipples and parts of external genitalia-simple tubular glands
two types: ____and ___ |
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Term
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Definition
secretory unit located in dermis; duct opens at a pore on stratum corneum surface
releases watery secretion |
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Term
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Definition
only found in axillary and pubic regions
duct opens in hair follicle
secretory unit located in dermis
(more viscous than other type) |
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Term
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Definition
all over body except for palms of hands and soles of feet
simple alveolar glands
softens and lubricates hair and skin
holocrine glands |
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Term
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Definition
| rupture and release oil(sebum) into hair follicle |
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Term
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Definition
strands of dead keratinized cells produced by hair follicles
contains hard keratin
color determined by amount of melanin produced by melanocytes |
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Term
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Definition
tougher than keratin of epidermis
it does not flake off cells |
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Definition
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Definition
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Term
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Definition
invagination of epidermal surface into the dermis
deep end is expanded forming hair bulb
bending a hair stimulates nerve endings; hairs are touch receptors |
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Term
| hair root follicle/ root hair plexus |
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Definition
| knot of sensory nerve endings wrapped around hair bulb |
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Term
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Definition
| mitotic cells are pushed up and keratinized |
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Term
| protection, synthesis of Vitamin D, body temp regulation, excretion of small amounts of nitrogenous wastes in sweat |
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Definition
| functions of integumentary system |
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Term
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Definition
| dermal blood vessels dilate and sweat glands activated sweat evaporates; carries heat from skin surface |
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Term
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Definition
dermal vessels constrict
blood is directed into internal organs and away from skin surface-(conserves heat) |
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Term
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Definition
deepest epidermal layer,firmly attached to dermis
consists of SINGLE ROW of cells |
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Term
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Definition
keratinocytes undergoing rapid cell division
numerous melanocytes
keratinocytes of this layer migrate into next |
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Term
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Definition
several layers thick
keratinocytes begin to shrink, irregular shape |
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Term
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Definition
melanin granules and Langerhan's cells are abundant
keratinocytes of this layer migrate into next layer |
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Term
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Definition
3-5 cell layers thick
keratinocytes flatten, nuclei and organelles begin to disintegrate |
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Term
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Definition
begin keratin production (ribosomes die last)
keratinocytes of this layer migrate into next |
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Term
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Definition
thin, transparent band superficial to stratum granulosum
consists of a few rows of flat, dead keratinocytes
present only in thick skin on palms and soles |
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Term
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Definition
outermost layers (20-30) of flat, dead skin cells
somewhat hardened dueto keratin accumulation (waterproofing)
cells are lost due to abrasion (protection) |
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Term
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Definition
| receptors for touch, pressure, pain, temp, and motor control of arrector pill muscles |
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Term
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Definition
| contains nerves, blood and lymphatic vessels(returns excess fluid to blood vessels), and hair follicles, sweat glands and oil glands (derived from epithelial tissue but located here) |
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Term
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Definition
| tissue damage due to intense heat, electricity, radiation, or chemicals. |
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Term
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Definition
only epidermis is damaged
localized redness
swelling and pain |
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Term
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Definition
epidermis and upper regions of dermis damaged
blisters appear |
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Term
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Definition
entire thickness of skin is damaged
discolored
little or no edema
no initial pain-nerve endings are destroyed |
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