Hair Follicle
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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.
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Human Skin, Hair, and NailsSource
Baker, W. Morrant & Harris, Vincent Dormer Kirkes' Hand-book of Physiology, 13th ed. (Philadelphia: P. Blakiston's Son & Co., 1892) 451
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