Longitudinal section of a hair follicle. Labels: a, Stratum of Malpighi, deep layer forming the external root sheath, and continued to the surface of the papilla to form the medullary sheath of the hair; b, second external sheath; c, internal root sheath; d, fibroid sheath of the hair; e, medullary sheath or medulla; f, hair papilla; g, blood vessels of the hair papilla; h, fibro vascular sheath.

Hair Follicle

Longitudinal section of a hair follicle. Labels: a, Stratum of Malpighi, deep layer forming the external…