Canadian Medical Guide > Anatomy > Tissues > Epithelium > Epidermis > Hair Follicle Terms and Definitions

Hair Follicle

Medical Definition:	A tube-like invagination of the EPIDERMIS from which the hair shaft develops and into which 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. (Stedman, 26th ed) Follicles of very long hairs extend into the subcutaneous layer of tissue under the SKIN.
Guide Notes:	dis = HAIR FOLLICLE (IM) + HAIR DISEASES (NIM); inflammation = FOLLICULITIS
Previously Indexed:	Hair (1966-1995)

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