. Text-book of normal histology: including an account of the development of the tissues and of the organs. he fibrous coat and the stratum mucosum of the epi-dermis only : at its upper extremity the stratum corneum additionallytakes part in the formation of the follicle. The fibrous coat of thefollicle consists of three layers : the outer, composed of longitudinally-placed bundles of connective tissue, rich in cells, and representing acondensation of the tissue of the corium ; the middle, representedby a layer of circular connective-tissue bundles continuous with thepapillary layer of the cuti
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. Text-book of normal histology: including an account of the development of the tissues and of the organs. he fibrous coat and the stratum mucosum of the epi-dermis only : at its upper extremity the stratum corneum additionallytakes part in the formation of the follicle. The fibrous coat of thefollicle consists of three layers : the outer, composed of longitudinally-placed bundles of connective tissue, rich in cells, and representing acondensation of the tissue of the corium ; the middle, representedby a layer of circular connective-tissue bundles continuous with thepapillary layer of the cutis; and the inner, a clear, homogeneous, narrow but conspicuous zone, the glassy or hyaline membrane.The latter separates the epithelium from the surrounding fibroustissue, and corresponds to a highly-developed basement-mem-brane. These layers of the fibrous sheath are not continued to anequal extent over the hair-follicle ; the outer longitudinal layer com-pletely invests the follicle, becomes continuous with the corium, andmaterially aids in maintaining the form of the follicle. The circular Fig. 306.. Transverse section^of hair-folliclesfrom human scalp : a, hair ; i, cuticleof hair; c, d, inner and outer rooi-sheath ; e, glassy membrane ;_/, fibroussheath; g, surrounding connectivetissue of corium ; h, fat-cells. Fig. 307. ^^*~~^ - ~. v -^