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57 terms

chapter 8 Properties of the Hair and Scalp

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