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Related Flashcards
Cards In This Set
| Front | Back |
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What is the cortex?
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Bulk, Core of Hair
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What is the medulla made of?
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Soft Keratin
2-3 layers thick.
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What parts of the hair are composed of keratinized epithelial cells?
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Shaft
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What are the 3 layers that create the hair root and shaft?
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Bulb, root, shaft
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How many hairs are in one square centimeter of skin?
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Up to 100 follicles
Back or dense areas up to 150
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Where does the hair follicle originate?
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Dermis, where it is rooted in the dermal papilla bulb and nourished by the capillaries that carry blood and oxygen to the bulb
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Why does hair turn gray?
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With age the amount of melanin in hair may decrease. Usually a mixture of unfaded, faded and white hairs
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Is dark hair always more dominant over light hair? Why?
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NO; dark hair is not necessarily dominant over light.
Hair color is controlled by genes.
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Why is hair red?
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Due to modified type of melanin containing iron.
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What does the papilla contain?
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Blood vessels
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What is the matrix and what does it do?
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Located inside the hair bulb where mitosisi occurs for hair cells where hair is formed. Porduces the internal epthilial root sheath.
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What parts of hiar contain hard keratin?
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The cortex and cuticle
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What is the papilla's funciton?
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To provide nourishment for the cell through bloodvessels
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What is the hair bulb?
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Below the surface of the skin; knob w/the base of the hair root.With the matix;papilla projects into the bulb to provide food for the matrix
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What is the cuticle?
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 Single layer of cells that forms the hair surface;Contains cuticle cells;hard keratin. Edges overlap like shingels on a roof. |
