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Ch. 7
Vocabulary
| Term | Definition |
|---|---|
| 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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