Flashcards

Frage	Antworten
Dermal Papilla	small, cone-shaped elevations at the base of the hair follicles.
Trichology	the study of hair.
Hair Cuticle	the outermost layer of the hair
Cortex	the middle layer of the hair
Medulla	the innermost layer of the hair and is composed of round cells.
Pityriasis	the technical term for dandruff, which is characterized by the excessive production and accumulation of skin cells
Malassezia	a naturally occurring fungus that is present on all human skin but causes the symptoms of dandruff when it grows out of control
Tinea	the technical term for ringworm
Pediculosis capitis	is the infestation of the hair and scalp with head lice
Furuncle	is the technical term for a boil, an acute, localized bacterial infection of the hair follicle that produces constant pain
Carbuncle	is an inflammation of the subcutaneous tissue caused by staphylococci
Helix	The spiral shape of a coiled protein
keratinization	Process by which newly formed cells in the hair bulb mature, fill with keratin, move upward, lose their nucleus, and die
Hydrogen Bonds	A weak, physical, cross-link side bond that is easily broken by water or heat.
Disulfide Bonds	Strong chemical side bond that joins the sulfur atoms of two neighboring cysteine amino acids to create one cystine, which joins together two polypeptide strands like rungs on a ladder
Lanthionine Bonds	The bonds created when disulfide bonds are broken by hydroxide chemical hair relaxers after the relaxer is rinsed from the hair.
Melanin	The tiny grains of pigment in the cortex that give natural color to the hair.
Vellus Hair	short, fine, unpigmented, and downy hair that appears on the body, with the exception of the palms of the hands and the soles of the feet.
Terminal Hair	Long, coarse, pigmented hair found on the scalp, legs, arms, and bodies of males and females.
Anagen	phase during which new hair is produced.
Catagen	The brief transition period between the growth and resting phases of a hair follicle. It signals the end of the growth phase.
Telogen	the final phase in the hair cycle that lasts until the fully grown hair is shed.
Trichoptilosis	Technical term for split ends.
Canities	Technical term for gray hair; results from the loss of the hair’s natural melanin pigment.
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.

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