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Integumentary p. 53+

Integumentary System p. 53-57

Integument skin, nails, hair, sweat glands, all of the structures we find in the dermis
Dermatology study of skin
Epidermis epithelial layer- stratified squamous epithelium
Dermis layer where we find connective tissue & many other structures; inner layer of the skin
Subcutaneous Layer beneath the skin, adipose tissue found here
Keratin wax-like protein, fills the dead cells in the epidermis, also in nails and hair
Melanin pigment in our skin, made by cells called melanocytes, UV light causes and increase in production of melanin, purpose is to protect dermis from UV light
Melanocytes produce melanin, all humans have approximately the same number, the difference is how much melanin the make; found near the basement membrane
Stratum Basale bottom/base layer; cuboidal cells that are dividing are found here, also melanocytes; function is to replace cells that are being lost
Stratum Corneum outer layer; find dead squamous cells that are filled with keratin; function to protect from friction, barrier- keeps out infection and keeps in moisture (water)
Papillae ridges at top of dermis, used for grip; mostly on our hands and feet, visible on our skin
Receptors detect changes in the dermis; sensitive to change, touch, thermal
Connective Tissue mostly collagen with a little elastin; function is strength & stretch
Blood Vessels function: transport nutrients, pick up waste, distribute heat, help control body temperature
Nerves & Receptors function: detect changes, send information about those changes to the central nervous system (brain & spine)
Sebaceous Glands always connected to a follicle; make sebum, keep moisture in
Sudoriferous Glands sweat glands
Apocrine Glands armpits & groin; respond to stress/excitement; go all the way down into the subcutaneous layer; contains oils that give sweat odor; form of communication
Eccrine Glands respond to temperature; sweat is mostly water with a little bit of salts; helps cool us
Pacinian Corpuscles larger & deeper; pressure sensors on the skin; found on internal organs as well as tendons & ligaments
Meissner Corpuscles closer to the surface; sensitive to a lighter touch; help us to feel texture
Arrector Pili Muscles attached to the base of hair follicles; communication, insulation-control body temperature
The Subcutaneous Layer adipose tissue for insulation, cushion & storage
Hair Follicles used as pores for sebaceous & apocrine glands, grow hair (sometimes)
Created by: bco