Hair Follicle

**Semantic type:** Body Part, Organ, or Organ Component

**Definition:** A tube-like invagination of the epidermis from which the hair shaft develops and into which the sebaceous glands open; the 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.

**Synonyms:** - Follicles - HAIR FOLLICLE - Hair Follicles - hair follicle