OF THE GLANDS OF THE SKIN. 



225 



in the case of free glands, from the corium, and containing 

 masses of cells, which exhibit different conditions according to 

 the part of the gland. If we proceed from the excretory 

 dnct of one of them (fig. 88 B), we see, that not only the 

 fibrous coat of the hair-sac, hut a portion of its inner root- 

 sheath also, passes into the duct, and lines it with nucleated, 

 rounded, or polygonal cells, disposed in several (two to six) 

 layers. This cellular layer is continued, becoming more and 

 more delicate, into the remoter parts of the gland, and ulti- 

 mately penetrates in- _. „„ 



* r Fig. 87. 



to the proper glandu- 

 lar vesicles, clothing 

 them with a single, 

 rarely a double, layer. 

 Internally to these 

 cells, which are distin- 

 guished by a greater 

 or smaller number 

 of fat granules from 

 the epithelial cells 



above them, there immediatelv succeed, 

 vesicles themselves, others (fig. 87 B b) containing more fat ; 

 and these finally pass into the innermost cells of the glan- 

 dular vesicles, which are invariably larger (of 0'016 — 0-028'") 

 than the middle and outermost cells, are rounded or elongated 

 in their form, and so filled with colourless fat that they might, 

 not improperly, be termed sebaceous cells (fig. 87 B). The 

 fat contained in them appears, either still to retain the 

 form of discrete drops (bb), as in the outer cells, or, as is 

 indeed more frequently the case, under that of larger drops ; 

 and in many cells there are but a few of them, or even only 

 a single one, which quite fills the cell (d); in consequence of 

 •which these cells greatly resemble the fat-cells of the pan- 



Fig. 87. A, a glandular vesicle of a common sebaceous gland, x 250 : a, epithe- 

 lium sharply defined, but without any investing membr ana propria, and passing con- 

 tinuously into the fat-cells, b (their contours are too indistinctly drawn), in the 

 interior of the glandular tube. B, sebaceous cells from the glandular tube, and the 

 cutaneous sebaceous matter, x 3.J0: a, smaller nucleated cells, still, more of an 

 epithelial character, and containing but little fat; b, cells abounding in fat, without 

 visible nucleus; c, cell, in which the fat is beginning to flow into one mass; d, cell 

 with one fat-drop; e, f, cells from which the fat has partiallv escaped. 



i. 15 



m 



the 



glandular 



