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properties of hair
Ch. 11 Properties and disorders of the Hair and Scalp
| Term | Definition |
|---|---|
| alopecia | the technical term for hair loss |
| alopecia arerata | the sudden falling out if hair in patches or spots |
| alopecia prematura | hair loss that occurs before middle age |
| alopecia senilis | hair loss occurring in old age |
| alopecia syphilitica | Hair loss as a result of syphilis |
| amino acids | the building blocks or units of structure in protein |
| anagen phase | growth phase in the hair cycle |
| androgenic alopecia | hair loss that occurs as a result of genetics, age, and hormonal changes; male pattern baldness |
| arrector pili | involuntary muscle fiber attached to the follicle |
| canities | technical term for grey hair |
| carbuncle | the result of an acute, deep-seated bacterial infection in the subcutaneous tissue |
| catagen phase | transition phase of the hair growth cycle |
| cortex | middle layer of the hair |
| cowlick | tuft of hair that stands straight up |
| cuticle | outermost layer of the hair shaft |
| dermal papilla | small, coned-shaped elevation located at the base of the hair follicle that fits into the hair bulb |
| disulfide bond | aka sulfur bond; a type of chemical cross bond found in the cortex |
| end bonds | aka peptide bonds; chemical bonds that join amino acids end to end |
| eumelanin | melanin that gives brown and black color to hair |
| follice | tubelike depression in the skin that contains the hair root |
| folliculitis barbae | aka barber's itch; bacterial infection of the hair follicles with inflamed pustules in the bearded areas. |
| furnucle | acute bacterial infection of the hair follicle, producing constant pain. aka boil |
| hair bulb | club-shaped structure that forms the lower part of the hair root |
| hair density | the amount of hair per square inch of scalp |
| hair elasicity | the ability of the hair to stretch and return to its original length |
| hair porosity | the ability for the hair to absorb moisture |
| hair root | the part of the hair that is encased in the hair follicle |
| hair shaft | the part of the hair that extends beyond the skin |
| hair stream | hair that flows in the same direction |
| hair texture | measures the diameter of the hair strand. fine, medium, coarse. |
| hydrogen bond | a physical side bond in the hair cortex |
| hypertrichosis | a condition of abnormal hair growth |
| keratin | the protein of which hair is formed |
| lanugo | vellus hair |
| malassezia | fungus that causes dandruff |
| medulla | center of the hair shaft |
| pediculosis captis | head lice |
| peptide bonds | end bonds; chemical bonds that join amino acids end to end |
| pheomelanin | melanin that gives red to blonde color to hair |
| pityriasis capitis simplex | dry dandruff type |
| pityriasis steatoides | waxy/greasy dandruff type |
| polypeptide chain | long chain of amino acids linked by peptide bonds |
| primary terminal hair | short, thick hairs that grow on the eyebrows and lashes |
| pseudofolliculitis barbrae | chronic inflammatory form of folliculitis known as "razor bumps" resembling folliculitis papules and pustules; generally accepted to be caused by ingrown hairs |
| salt bond | a physical side bond within the hair cortex |
| secondary terminal hair | long hair found on the scalp, beard, chest, back and legs |
| side bonds | aka cross bonds; hydrogen, salt and sulfur bonds in the cortex |
| sycosis vulgaris | chronic bacterial infection of the bearded areas of the face |
| telogen phase | resting phase of the hair growth cycle |
| tinea | technical term for ringworm |
| tinea capitis | ringworm of the scalp |
| tinea favosa | ringworm characterized by dry, sulfur-yellow crusts on the scalp |
| tinea sycosis | ringworm of the bearded areas on the face |
| trichology | the science of dealing with the hair, its diseases, and its care |
| vellus | soft, downy hair that apprears on the body |
| wave pattern | amount of movement in the hair strand. straight, wavy, curly, and coiled |
| whorl | hair that grows in a circular pattern |
Created by:
BSPittsburgh
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