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