The hair matrix, or simply matrix, produces the actual hair shaft as well as the inner and outer root sheaths of hair.[1] [1]James, William; Berger, Timothy; Elston, Dirk (2005) Andrews' Diseases of the Skin: Clinical Dermatology (10th ed.). Saunders. Page 8. ISBN 0-7216-2921-0. This dermatology article is a stub. You can help Wikipedia by expanding it.vte