Term
| Name the five main structures of the hair root. |
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Definition
1) The hair follicle
2) The hair bulb
3) The dermal papilla
4) The arrector pili
5) The sebaceous glands |
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Term
| Describe the hair follicle. |
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Definition
| The hair follicle is the tube-like depression or pocket in the skin or scalp that contains the hair root. |
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Term
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Definition
| The hair bulb is the lowest part of the hair strand. It is the thickened, cubed-shaped structure that forms the lower part of the hair root. |
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Term
| Describe the dermal papilla. |
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Definition
| The dermal papilla is a small cone-shaped elevation located at the base of the hair follicle that fits into the hair bulb. It contains the blood and nerve supply that provides nutrients needed for hair growth. |
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Term
| Describe the arrector pili. |
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Definition
| The arrector pili muscle is the small, involuntary muscle in the base of the hair follicle. Strong emotions or a cold sensation causes the muscle to contract, which results in the hair standing up straight better known as goose bumps. |
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Term
| Describe the sebaseous glands. |
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Definition
| The sebaseous glands are the oil glands in the skin that are connected to the hair follicles. They secrete a fatty or oily substance called sebum which lubricates the skin. |
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Term
| List the three main layers of the hair shaft. |
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Definition
1) The hair cuticle
2) The cortex
3) The medulla |
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Term
| Describe the hair cuticle. |
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Definition
| The hair cuticle is the outtermost layer of the hair. It provides a barrier to protect the inner structure of the hair. |
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Term
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Definition
| The cortex is the middle layer of the hair. The elasticity and natural color of the hair is the result of the unique protein structures located within the cortex. |
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Term
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Definition
| The medulla is the innermost layer of the hair and is composed of round cells. Usually only thick, course hair contains a medulla. (All male beard hairs contains a medulla). |
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Term
| Describe the three types of side bonds in the cortex. |
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Definition
1) Hydrogen bond- eaisly broken by water or heat
2) Salt bond- eaisly broken by strong alkline or acidic solutions
3) Disulfide bond- broken by permanent waves and relaxers that alter the shape of the hair. |
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Term
| Describe the hair growth cycles. |
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Definition
1) Anagen Phase- New hair is produced
2) Catagen Phase- the stage between the growth and resetting of the hair follicle
3) Telogen Phase- the final stage of the hair cycle which remains until hair is shed |
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Term
| List three causes of abnormal hair loss. |
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Definition
1) Androgenic alopecia- A result of genetics, age, or hormonal changes.
2) Alopecia areata- A result of hair follicles that have been attacked by a persons own immune system
3) Postpartum alopecia- Experienced at the end of a pregnacy. |
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Term
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Definition
| The technical term for grey hair. |
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Term
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Definition
| Trichoptilosis is the technical term for split ends |
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Term
| What is another name for Trichorrhexis nodosa? |
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Definition
| Trichorrhexis nodosa is the technical term for knotted hair |
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Term
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Definition
| Fragilitas is a term for brittle hair |
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Term
| Dandruff, fungal infections, parasitic infections, and staphylococci infectons are all ... |
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Definition
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Term
| Name the most important factors to consider while performing a hair analysis on your clients. |
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Definition
| Texture, density, porosity, and elasticity |
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Term
| What does COHNS stand for? |
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Definition
| Carbon, oxygen, hydrogen, nitrogen, and sulfer that makes up human hair,skin, tissue, and nails |
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