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Integumentary major regions
epidermis (outerlayer)
dermis (middle region)
hypodermis (subcuntaneous)
function of integumentary system
protection
regulates body temp.
sensation fo touch anf pain
prevents excess water loss
synthesizes vitamin D
Blood reservoir
Excrretion
Layers of Epidermis
(top to bottom)
Stratum corneum
Stratum lucidum
Stratum granulosum
Stratum spinosum
Stratum basale
Layers of Dermis
Papillary region
— areolar CTP
— peglike projections called dermal papillae (fingerprints)
Recticular region
— dense irregular CTP
— 80% of the thickness in skin
Hair
has hard keratine
made up of:
— shaft projecting from skin
— root embedded in the skin
arrector pili muscle attaches to hair
nail
free edge, body, nail bed