Hair Follicle Biology, the Sebaceous Gland, and Scarring Alopecias

August 1999 in “ Archives of dermatology ”

Kurt S. Stenn, John P. Sundberg, Leonard C. Sperling

hair follicle sebaceous gland scarring alopecias hair shaft inner root sheath outer root sheath sebaceous duct pilary canal

TLDR Hair follicles grow hair and release it through the skin.

The document discussed the complex functions of the hair follicle, emphasizing its ability to produce the multicellular hair shaft while maintaining an "epithelial finger" in the deep dermis. It described the process by which the hair shaft, along with the inner root sheath, moves outward as a unit, facilitated by a slippage plane in the outer root sheath. The hair shaft is eventually separated from the sheath below the sebaceous duct and exits the pilary canal as a sheath-free hair fiber.

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