trichology
The study of hair
3 types of hair follicle
round, oval & elliptical
cuticle layer
outer layer of the hair, hard resistant layer
cortex
middle layer of the hair, soft elastic quality
medulla
center layer of the hair
keratinization
process where cells change their shape, dry out & form keratin protein
hair
primarily made up of protein
anagen
growing stage" hair bulb has an attached root sheath. hair is darker
catagen
transitional stage" ALL cell division stops. only lasts a few weeks.
telogen
resting stage" hair bulb has no attached root sheath. Hair falls out.
melanin
gives skin & hair their color
eumelanin
black/brown color
pheomelanin
red in color, melanin that provides natural hair colors from red and ginger to yellow/blond tones
albinism
absence of pigmentation in the eyes and skin and hair
texture
degree of coarseness or fineness in the hair fiber
density
judged by the # of active hair follicles per square inch
hair porosity
the ability of the hair to absorb moisture
hair elasticity
the ability of the hair to stretch and return to its original length without braking
broken hair
abraded hair
Split ends
trichoptilosis
matting
pilica polonica"; hair tangled together
nodules
trichorrhexis nodosa" presence of lumps or swelling along the hair shaft
canities
technical term for gray hair
ringed hair
Alternating bands of gray and dark hair.
hypertrichosis
is an excessive growth of hair
monilethrix
technical term for beaded hair
psoriasis
a chronic skin disease characterized by dry red patches covered with scales
dandruff
loose scales shed from the scalp
ringworm
Scaly, Round, itchy patch on skin. (Contagious)
ringworm of the scalp
enlarged open hair follicles that are surrounded by clusters of red spots
honeycomb ringworm
dry, yellow, encrusted areas on the scalp
itch mite
scabies
head lice
infestation of head lice on the scalp
lanugo
baby fine, silky hair
vellus
short, fine, non-pigmented hair
alopecia
excessive hair loss
androgenetic alopecia
heredity, hormones & age
postpartum alopecia
hair loss due to pregnancy
alopecia areata
round or irregular patches w/o an inflamed scalp
telogen effluvium
premature shedding of hair
traction or traumatic alopecia
repetitive traction on the hair by pulling and twisting