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Skin
Integumentary System
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• Protection against infection, foreign agents
• Protection against dehydration & secretion of salts & water
• Regulation of body temperature
• Collection of sensory information
• Synthesis of vitamin D; Storage of lipid reserves
5 Main Functions of Skin
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Nerves in the Skin
Merkels’s Disks
Paciniancorpuscle
Free Nerve endings
Hair Follicle ending
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Epidermis
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Skin Color
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Dermis
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Subcutaneous Layer
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Skin Disorders
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Lesions
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PsoriasisRingworm - Tinea
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Burns
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ABCDE Method to Screen for Melanoma
A … Asymmetry (lopsided)
B … Border irregularity (edges are ragged, blurred or irregular)
C … Color variation (color uneven, may include shades of black, brown and tan)
D … Diameter larger than 6 millimeters
E … Evolution, or changes in the lesion
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A ¾ inch square patch of skin on the back of the hand (~ 1/20 of an inch thick) contain:
9 feet of blood vessels, 600 pain sensors, 30 hairs, 300 sweat glands, 4 oil glands,
13 yards of nerves, 9000 nerve endings, 6 cold sensors, 75 pressure sensors
How many of each of these are in the skin on your hand?