Follicle, Hair

Medical Condition:
Follicle, Hair

A tube-like invagination of the epidermis from which the hair shaft develops and into which the sebaceous glands open. The hair follicle is lined by a cellular inner and outer root sheath of epidermal origin and is invested with a fibrous sheath derived from the dermis. Its anatomical designation is folliculus pili. (From Stedman, 25th ed)