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Ch. 7

Vocabulary

TermDefinition
Trichology The study of hair
Hair follicle Forms from a cluster of cells in the upper layer of skin
Primitive hair germ The cluster of cells that need nourishment to grow into a fully developed follicle
Root sheath Follicle or tube like pocket
Shape of the hair shaft The shape of the hair follicle will determine the shape of what?
Papilla The root of the hair
Germinal Matrix What produces cells that ultimately keratinize and form the 3 major layers of hair
Cuticle Outer covering of the hair shaft made up of over lapping layers of transparent scales
Cortex Second layer consisting of unique protein structures. Gives hair most of its pigment and strength.
Medulla The central core of the hair shaft, also called the pith or marrow (often absent in fine or very fine hair)
Arrector Pili Muscle Comes from cells in the dermis that attach to the follicle just below the sebaceous gland.
Keratinization Process whereby cells change their shape, dry out, and form keratin protein
Protein Hair is made up of primarily of what?
Anagen Active growth stage
Catagen Brief transitional stage in hair growth
Telogen Resting stage of hair growth
1/2" a month Average rate of hair growth a month
Heredity, environment, products, and appliances The four factors that affect the behavior of hair
Cuticle Protective layer of the hair shaft and is made up of a harder protein than the cortex
Melanocytes Cells that exist among the dividing cells within the hair bulb.
Melanosomes Collect together and form bundles of pigment protein complex
Eumelanin Brown/black in color
Pheomelanin Red in color
Albinism Total lack of pigmentation in the hair or skin
Gray hair Reduced color pigment, melanin, in the cortex layer of the hair
Density Hair is judged by the number of active hair follicles pear square inch on the scalp. Whether your clients hair type is fine, medium, or course.
Porosity The ability of the hair to absorb moisture, liquids, and chemicals
Elasticity Ability of the hair to stretch and return to its original shape without breaking
Abraded hair Technical term for broken hair
Fragilitis crinium Technical term for split ends
Pilica Polonica Technical term for excessive matting
Trichorrhexis Nodosa Characterized by the presence of lumps or swelling along the hair shaft
Canities Grayness or whiteness of the hair
Hypertricosis Describes an abnormal coverage of hair on areas of the body where baby fine hair appears
Monilethrix Beads or nodes formed on the hair shaft is?
Psoriasis Thick crust patche's of red irritated scalp resulting from an autoimmune disease of the skin.
Pityriasis Chronic scalp condition with excessive flaking, which accumulates on the scalp or falls to the shoulders, as well as itchiness, tightness, and irritation of the scalp.
Pityriasis Capitis Simplex Dry flakes attached to the scalp or on the hair which can appear translucent
Pityriasis Steatoides Oily flakes combine with sebum which stick to the scalp in clusters and can appear yellowish in color
Tinea Capitis Enlarged open hair follicles that are surrounded by clusters of red spots; hair is likely to break in area infected; black spots may also be visible
Tinea/ ringworm Red, circular patch of small blisters; caused by a vegetable parasite.
Tinea Favosa/Favus Dry, yellow, encrusted areas on the scalp called scutula; may have a preticular odor; shiny pink or white scars may result
Scabies Red and watery vesticles or pus-filled areas caused by an animal parasite burrowing under the skin
Prediculosis Capitis
Alopecia Excessive hair loss
Alopecia Areta Sudden loss of hair in round or irregular patches without display of an inflamed scalp
Telegenic Effluvium Premature shedding of hair in the resting phase. Can result from various causes such as childbirth, shock, drug intake, fever, etc.t
Traction or Tramatic Alopecia Hair loss due to repentive traction on the hair by pulling or twisting
Created by: Kgallardo
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