Hair follicles

Hair Follicle: 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.1

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References

  1. Source: MeSH (U.S. National Library of Medicine)

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