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Hair Theory

Pivot Point Trichology

Trichology Technical term for the study of hair
Hair bulb The only part of the hair that is alive.
hair fiber The part of the hair that extends beyond the skin. hair shaft.
hair strand The part of the hair that extends beyond the skin. hair fiber
hair follicle The shaft hair grows out of. The size of this determines the diameter of the hair. The shape of this determines if hair is straigh, wavy or cury.
basal layer Cell division takes place.
Epicermis Outermost layer of the skin.
Primitive hair germ The cluster of cells at the basal layer of the epidermis
Dermal layer Underlying or inner layer of the skin. contains connective tissues and a portion the hair follicle.
Hair root Portion of hair that is inside the hair follicle under the skin's surface
Papilla hair structure filled with capillaries that supplies
Keratinize Cells change shape, dry out and form this protein: the cells are no longer alive.
Cuticle overlapping transparent outer covering of the hair shaft.
Cortex The second layer of the hair consisting of protein
Medulla The central core of the hair: sometimes absent in fine hair
Sebacceous glands oil glands
Sebum secretion of fatty oil substance
Acid mantle mixture of sebacceous glands (oil) and sudoriferous glands (sweat) to keep skin and hair soft and supple
Arrector pilli muscle The muscle that couses hair to stand on end when scared or cold
anagen Active or growing stage of hair
Catagen Brief transitional stage of hair cycle in which cell dividion stops
Telogen The resting stage of the hair cycle in which hair has no attached rooth sheat and falls out.
Cilia Eyelash hair
melanin Pigment that give hair and skin its color
Melanocytes pigment producing cells
Eumelanin pigment that gives hair brown or black color. The more present in hair, the darker hair is.
Pheomelanin Pigment that gives hair its red color.
Albinism Lack of produciton of the melanocytes
broken hair results from improper brushing of hair.
split ends brittle hair or trichoptilosis: cracks deep in the cutile into the cortex layer
matting pilica polonica: tangled hair, as in excessive back combing
Nodules Trichorrexis nodosa: knotted haiar with presnce of lumps or swelling alon the shaft: from vigorously rubbing as in towel drying
Canities greying or white hair: loss of pigment as someone ages
ringed hair alternating bands of grey and dark hair
hypertrichosis abnormal coverage of hair on areas of the body usually covered in lanugo hair
moniletrix beads or nodes formed on the hair shaft
Psoriasis thick crusty patches of red irritated scalp
Dandruff pityriasis: chronic scalp condition with excessive flaking
pityriasis capitis simplex dry flakes attached to the scalp or hair
pityriasis steatoids oily flakes combined with sebum
Tinea Ringworm: red circular patches of small bilsters
tinea capitis enlarged open hair follicles surrounded by red or black spots
tinea favosa dry, yellow, encrusted areas on the scalp: shiny pink or odor
scabies itch mites: red and watery: burrows under the skin
pediculosis capitis head lice
postpartum alopecia hair loss occurs after giving birth
alopecia areata loss of hair in round or irregular patches: no obvious skin disorder.
telogen effluvium Premature shedding of hair in the telogen (resting) phase of hair. caused by stress.
Created by: annalder