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Related Flashcards
Cards In This Set
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Follicle
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 A tube like depression that is filled with the hair root |
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Hair Root
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Located below the surface of the scalp.
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Hair Shaft
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Is the portion of hair that projects above the skin
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Hair Bulb
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A thickened club like stucture that forms the lowest part of the hair root
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Dermal papilla
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Is a small cone like elevation at the base of the follicle that fits into the hair bulb containing blood and nerve supply and provides nutrients.
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Arrector Pili
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A small involuntary muscle fibre that is inserted into the base of the hair follicle and contracts when exposed temperature change.
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Subaceous Gland
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Glands of the skin connected to the follicle that secrete natural oil called Sebum, Sebum lubricates the hair and skin.
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Cuticle
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The outermost layer of the hair consisting of single overlapping layers of translucent scale like cells that overlap like shingles on a roof. A healthy compact layer helps protect hair against damage.
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Cortex
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The middle layer of the hair shaft that contains 90% pigment of the hairs total and gives strenght and elasticity
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Medulla
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Is the innermost layer composed of round cells and not always present, fine or blonde hair lacks medulla
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THE CHEMICAL COMPOSITION OF THE HAIR FOLLICLE
The Hair is composed of _______ that grows from cells withink the follicle. This is where the hair shaft begins. As soon as these cells form the move upward through the follicle. |
Protein
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As the cells ___ they fill up with fibrous protein called keratin, move upward, lose thir nucleus and die This Maturing process is called ?
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Keratinization by the time the hair emerges from the scalp the cells are kertanized and no longer living.
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The hair is composed of what percentage of Protein
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90%
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The five elements that make up the hair are
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Carbon, Oxygen, Nitrogen, Sulfur, and Hydrogen
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Hydrogen Bond
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Is a weak physical side bond broken by water or heat.
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