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22 Cards in this Set
- Front
- Back
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what is another name for hair?
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pili
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What parts of the body is hair NOT found?
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Anywhere thick skin is present (palms, lips, and soles of feet), and portions of the external genitalia.
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What is a single hair called and what is its composition?
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Pilus: composed of keritinized cells growing from a hair follicle
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how deep does the hair follicle extend?
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Extends deep into the dermis, often projecting into the underlying subcutaneous layer.
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What layer is hair located in, and what layer does it stem from.
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Physically located in dermis, made up of epidermal cells.
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what are the 3 recognizable zones along the length of the hair?
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1.hair bulb
2.Root 3.Shaft |
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What type of cells does the hair bulb consist of?
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Epithelial cells
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What helps the stratum basale cells of the hair bulb for the hair?
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A tiny cluster of dermal nerves and blood vessels
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What portion of the hair extends beyond the epidermal surface and what is it composed of
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The shaft, composed of dead keratinized cells
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What is the hair follicle?
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An oblique tube that surrounds the hair, it has an inner sheath of epithelial cells.
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What extends from the connective tissue sheath around the hair follicle to the connective tissue of the dermal papillae?
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thin ribbons of smooth muscle: the arrector pili muscle
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what happens when the arrector pili muscles contract?
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pulls on hair follicles which elevates the hairs and causes "goose bumps"
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What are the 6 functions of hair?
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1.protection
2. heat retention 3. facial expression 4. sensory reception 5. Visual identification 6. chemical signal dispersal |
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How do hairs help in chemical signal dispersal?
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hairs help disperse pheromones
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What organ detects pheromones released by hair?
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the vomeronasal organ
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What 2 regions secrete pheremones on the human body?
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axillary and pubic regions
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What extends from the connective tissue sheath around the hair follicle to the connective tissue of the dermal papillae?
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thin ribbons of smooth muscle: the arrector pili muscle
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what happens when the arrector pili muscles contract?
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pulls on hair follicles which elevates the hairs and causes "goose bumps"
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What are the 6 functions of hair?
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1.protection
2. heat retention 3. facial expression 4. sensory reception 5. Visual identification 6. chemical signal dispersal |
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How do hairs help in chemical signal dispersal?
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hairs help disperse pheromones
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What organ detects pheromones released by hair?
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the vomeronasal organ
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What 2 regions secrete pheremones on the human body?
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axillary and pubic regions
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