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THE PATHOLOGY AND TREATMENT OF SYCOSIS.Read in the Section of Dermatology and Syphiligraphy at the Forty-first Annual Meeting of the American Medical Association, at Nashville, Tenn., May, 1890.

JOHN V. SHOEMAKER, A.M., M.D.
JAMA. 1890;XV(5):177-179. doi:10.1001/jama.1890.02410310017001e.
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ABSTRACT

Pathology.—In order clearly to comprehend the pathology of sycosis it is of advantage to consider the structure of hair, the mode of its growth and nutrition.

Hair is a modification of the epithelial layer of the integument. The root of each hair is lodged in a little pit called the hair follicle. The follicle descends through the substance of the skin into the subcutaneous connective tissue. Its orifice is shaped like a funnel, the narrower and lower end of the funnel being known as the neck. Below the neck the follicle widens and terminates in a bulbous expansion. The proper wall of the hair follicle belongs to the corium and is divided into three layers: an outer, a middle and an internal. The outer is the thickest and consists of connective tissue fibres disposed parallel to the long axis of the follicle. It supports a small artery and vein and

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