hair follicle
a structure composed of epithelium that surrounds the root of a hair
A hair follicle is a small cavity or pocket found in the skin that produces and grows hair. The follicle surrounds the root of the hair and contains sebaceous glands that secrete oil to lubricate the hair and skin. The hair follicle grows in a cycle, with the active growth stage known as the anagen phase, followed by a transition phase called the catagen phase, and finally a resting phase known as the telogen phase before the hair falls out and the cycle begins anew. The hair follicle is important for regulating hair growth and protecting the skin from external factors such as bacteria and UV radiation. disorders of hair follicles, such as alopecia, can be caused by genetics, hormonal imbalances, or environmental factors.
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