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Hair root

the part of the hair contained within the follicle, below the surface of the scalp

Hair shaft

the portion of the hair that projects beyond the skin


Main protein in hair


tube like depression or pocket in the skin or scalp that contain the hair root

Hair bulb

lowest part of a hair strand, the thickened club shaped structure that forms the lower part of the hair root


structure within follicle which is a small projection at bulb; provides blood supply

Arrector Pili

a smooth muscle attached to hair follicles that causes "goose bumps" to appear on the skin when contracted

Sebaceous Glands

oil glands in the skin that produce sebum


outermost layer of hair


Middle layer of the hair, afibrous protein core formed by elongated cells containing melanin pigment


innermost layer of the hair and is often called the pith or core of the hair




a person or organism lacking pigmentation, resulting in abnormally pale or white skin or lack of color

Terminal Hair

long hair found on the scalp as well as on legs, arms, and body of both males and females

Vellus hair

type of hair that is short, fine, soft, & nonpigmented; covers the body


growth phase in the hair cycle in which a new hair shaft is created


the brief transition period between the growth and resting phases of a hair follicle


resting phase , the final phase in the hair cycle that lasts until the fully grown hair is shed


hair loss

Alopecia Areata

an autoimmune disorder that attacks the hair follicles, causing well-defined bald areas on the scalp or elsewhere on the body

Androgenetic Alopecia

most common form of alopecia, a combination of heredity, hormones and age that causes progressive shrinking or miniaturization of certain scalp follicles, also called male pattern baldness

Traumatic Alopecia

Loss of hair from pulling and yanking or by other traumatic means.

Postpartum Alopecia

temporary hair loss experienced at the conclusion of a pregnancy


technical term for gray hair; results from the loss of the hair's natural melanin pigment

Hypertrichosis or hirsuties

abnormal hair growth


Split ends

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