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20 Cards in this Set
- Front
- Back
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Trichology |
The technical term for the study of hair.
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Follicle
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A cluster of cells in the upper layer of the skin; the cluster pulls the upper layer down with it, creating a tube-like pocket called the root sheath, out of which the hair will grow.
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Hair Bulb
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The root of the hair ends in an enlargement, the hair bulb, which is whiter in color and softer in texture than the shaft, and is lodged in a follicular involution of the epidermis called the hair follicle.
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Hair Root
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The portion of hair that is inside the hair follicle under the skin's surface.
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Hair Fiber
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Sometimes referred to as the hair shaft or strand; the portion of the hair that extends above the skin's surface.
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Papilla
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Filled with capillaries (small blood vessels) that supply nourishment to the cells around it, called germinal matrix cells.
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Germinal Matrix Cells
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Germinal Matrix - The area of the hair bulb where cell division (mitosis) takes place.
Germinal Matrix Cells - Produce the cells that ultimately keratinize (harden) and form the three major layers of the hair. |
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Cortex
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The inside of the second layer of the hair fiber (gives hair most of its pigment and strength [elasticity] ).
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Cuticle
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The outer covering of the hair shaft; the loose and pliable skin around the nail.
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Keratin/Keratinization
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Keratin - A protein that accounts for 97% of the makeup of hair.
Keratinization - The process whereby cells change their shape, dry out and form keratin protein; once keratinized, the cells that form the hair fiber or strand are no longer alive. |
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Eumelanin
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The type of melanin that produces brown/black hair color.
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Pheomelanin
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The type of melanin that produces red hair color.
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Albinism
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A congenital failure of the skin to produce melanin pigment.
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Alopecia
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Excessive hair loss.
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Pilica Polonica (Matting)
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Refers to excessive matting of hair, characterized by a mass of hair strands tangled together in a mat that cannot be separated.
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Trichorrhexis nodsa (Nodules)
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Knotted hair, characterized by the presence of lumps or swelling along the hair shaft.
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Canities
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Refers to the grayness or whiteness of the hair.
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Hypertrichosis
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Referred to as hirsuties or superfluous hair; the abnormal coverage of hair on areas of the body where normally only lanugo hair appears.
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Monilethrix
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Monilethrix is a condition in which beads or nodes form on the hair shaft.
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Lanugo
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Lanugo is the term assigned to the baby fine, silky hair that is shed shortly after birth.
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