Skin (Integument) External body covering Functions Insulation Protects Prevents water loss...
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Transcript of Skin (Integument) External body covering Functions Insulation Protects Prevents water loss...
Skin (Integument) External body covering Functions
Insulation Protects Prevents water loss Temperature regulator Vitamin D Senses
Layers Epidermis, dermis
EpidermisStratum corneum-dead cellsStratum lucidum -thin layer of flat,
dead keratinocytesStratum granulosum -flattened cells;
lamellated granulesStratum spinosum-cells rapidly
dividestratum basale -actively dividing;
contain melanocytes
Dermis Between dermis and subcutaneous layer Dense irregular connective tissue Layers
Papillary layer -areolar connective tissue; fingerprints (epidermal ridges); touch receptors (meissner’s corpuscles)
Dermal papillae-attach dermis to epidermis
Reticular layer -deepest; dense irregular connective tissue; sweat, sebaceous glands, pressure receptors (Pacinian corpuscles)
Hypodermis Below integument Stabilizes Deposits of fat
Protects Protection of openings Sensitive to touch Hair follicle -dense connective tissue sheath;
produces nonliving hair Hair root -lower part of hair; attached to skin Hair shaft -upper part; not attached Arrector pili muscle -muscle attached to hair
follicle
Cutaneous glands Sebaceous glands -lubricates skin (oil and
sweat) Eccrine glands -perspiration Apocrine glands -found in armpits and
genital areas; produce odor