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Integumentary System Larissa Amaya (layers of the epidermis (stratum…
Integumentary System Larissa Amaya
function of the integumentary system
Excretion
rids the body of waste in the form of urea.(sweat)
sensation
vibration
temperature
touch
pain
regulation of body temperature.
low temperature
surface vessels contract.
shivering.
high temperature
sweating
dilate surface blood vessels
synthesis of vitamin D
Body membranes
connective tissue membrane.
mucous membrane
absorption and secretion. produces mucus.
layer of epithelium over loose connective tissue; epithelium varies with location.
lines cavities that open to exterior.
cutaneous membrane
major organ of the integumentary system. covers body surface.
made of keratinized stratified squamous epithelium underneath is dense connective tissue.
serous membrane
separated by fluid.
partietal
visceral
simple squamous epithelium over loose connective tissue.
secrete serous (watery) fluid for lubrication.
lines cavities and cover organs closed to exterior
layers of the epidermis
stratum basale
attached to basement membrane
separates dermis from epidermis
stratum lucidum
more apparent in thick skin such as palms of hands and soles of feet/
2-3 layers keratinocytes
stratum spinosum
spiny appearance
several layers thick keratinocytes from stratum basale, take in melanin.
stratum granulosum
keratinization begins here and cells beginning to die
3-5 layers keratinocytes
stratum corneum
20-30 layers tightly packed of flat cells full of keratin
keratin is waterproof
layers of the skin
outer layer
Made of keratinized stratified squamous epithelium
inner layer
made of connective tissue
burns
first degree burn
only epidermis is damaged
healing in few days to 2 weeks
second degree burn
destroys epidermis and upper part of dermis
blisters form
third degree
destroys epidermis,dermis and accessory organs of skin
appears white,red, or blackened
infections
cold sores
herpes simplex virus type 1
triggered by exposure to uv rays or stress, spread by kissing
impetigo
pink water filled raised lesons that develop to yellow crust and eventually rupture
boils and carbuncles
infection causing inflammation of hair follicles and sebaceous glands by bacteria from friction with clothing or shaving
accessory organs
nail
lunula
moon-shape close to cuticle
cuticle
skin and nail attach
root
portion embedded in the skin
body
underneath the nail
nail bed
of nail production
nail matrix
portion of nail hanging over nailbed
free edge
hair
hair root
portion of hair underneath the skin
hair shaft
portion of hair above the skin
hair follicle
dermal and epidermal sheath surrounds hair root
hair bulb
enlarged base of hair
hair papilla
base of root
hair matrix
surrounds hair papilla
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