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58 Cards in this Set
- Front
- Back
abnormal hair loss
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alopecia
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sudden falling out of hair in round patches or baldness in spots; may occur on scalp and elsewhere
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alopecia areata
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units of structure in protein
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amino acids
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growth phase in hair cycle in which new hair is synthesized
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anagen phase
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male pattern baldness; hair loss characterized by miniaturization of terminal hair, which is converted to vellus hair
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androgenic alopecia or androgenetic alopecia
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minute, involuntary muscle fibre in skin inserted in base of hair follicle
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arrector pili
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technical term for grey hair; result from loss of hair's natural melanin pigment
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canities
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inflammation of subcutaneous tissue caused by staphylococci; similar to furuncle but more extensive
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carbuncle
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brief transition period between growth and resting phases of hair follicle
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catagen phase
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five elements that make up human hair
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COHNS elements (carbon, oxygen, hydrogen, nitrogen, and sulfur)
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middle layer of hair; a fibrous protein core formed by elongated cells, containing melanin pigment
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cortex
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tuft of hair that stands straight up
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cowlick
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outermost layer of hair, consisting of a single, overlapping layer of transparent, scale-like cells
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cuticle
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small, cone-shaped elevation located at the base of hair follicle that fits into hair bulb
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dermal papilla
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chemical side bond that joins sulphur atoms of two neighbouring cysteine amino acids to create cystine
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disulfide bond
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melanin that gives brown and black colour to hair
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eumelanin
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tube-like depression or pocket in skin or scalp containing hair root
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follicle
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technical term for brittle hair
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fragilitas crinium
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boil; acute, localized bacterial infection of hair follicle
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furuncle
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lowest area or part of a hair strand; thickened, club-shaped structure that form the lower part of the hair root
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hair bulb
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number of individual hair strands on one square inch of scalp
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hair density
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ability of hair to stretch and return to original length without breaking
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hair elasticity
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ability of hair to absorb moisture
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hair porosity
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part of hair contained within follicle, below surface of scalp
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hair root
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portion of hair that projects beyond skin
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hair shaft
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hair flowing in same direction; result of follicles sloping in same direction
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hair stream
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thickness or diameter of individual hair strand
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hair texture
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physical side bond, easily broken by water or heat
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hydrogen bond
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condition of abnormal growth of hair, characterized by growth of terminal hair in areas of body that normally grow only vellus hair
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hypertrichosis
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process of being keratinized; newly formed cells in hair mature, fill up with keratin, move upward, lose their nucleus, and die; hair shaft is a nonliving fibre composed of keratinized protein
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keratinization
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reclassified term for fungus originally named pityrosporum
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malassezia
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innermost layer of hair, sometimes referred to as the pith; compose of round cells; often absent in fine hair
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medulla
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tiny grains of pigment in cortex giving natural colour to hair
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melanin
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technical term for beaded hair
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monilethrix
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infestation of hair and scalp with head lice
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pediculosis capitis
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chemical bond joining amino acids to each other
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peptide bond or end bond
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melanin that provides natural hair colours from red and ginger and yellow/blonde tones
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pheomelanin
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dandruff; an inflammation of the skin characterized by formulation and flaking of fine, thin scales
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pityriasis
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technical term for scalp inflammation marked by dry dandruff, thin scales, and an itchy scalp
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pityriasis capitis simplex
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scalp inflammation marked by fatty (greasy or waxy) types of dandruff
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pityriasis steatoides
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long chain of amino acids liked by peptide bonds
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polypeptide chain
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temporary hair loss experienced at the conclusion of pregnancy
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postpartum alopecia
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variety of canities, characterized by alternating bands of gray and pigmented hair throughout the length of hair strand
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ringed hair
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physical side bond that is broken by changes in pH
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salt bond
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dry, sulfur-yellow, cup-like crusts on the scalp in tinea favosa or favus
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scutula
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oil glands of skin, connected to hair follicles
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sebaceous glands
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fatty or oily secretion of sebaceous glands, which lubricates hair and skin
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sebum
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resting phase; final phase in hair cycle that lasts until fully grown hair is shed
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telogen
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long, soft hair found on scalp, also on legs, arms, and body
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terminal hair
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medical term for ringworm; contagious condition caused by vegetable parasites
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tinea
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ringworm of the scalp
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tinea capitis
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ringworm characterized by dry, sulfur-yellow, cup-like crusts on scalp, called scutula
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tinea favosa, tinea favus, or honeycomb ringworm
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science dealing with hair, its diseases, and care
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trichology
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technical term for split ends
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trichoptilosis
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knotted hair, characterized by brittleness and the formation of nodular swellings along hair shaft
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trichorrhexis nodosa
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short, fine, downy hair that appears on body, with exception of palms of hands and soles of feet
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vellus or lanugo
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amount of movement in hair strand; described as straight, wavy, curly, and extremely curly
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wave pattern
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hair that forms in circular pattern, as on crown
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whorl
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