. Compendium of histology. Histology. 182 SEVENTEENTH Let us now examine the organ at the height of its activity in the body of the nursing woman (Fig. 161). The gland vesicles, rounded or elongated (o. 1128 to o. 1872 mm.), are formed by a membrana propria with fiat stellate cells. They have a simple lining of low cylinder cells (of mm.). Those finest se- cretory canals between the cells, which we have already mentioned at p. 134, have also been demon- strated here by means of injections. The excretory canal-work also has a cylindrical epithelium. How far the fatty secretion
. Compendium of histology. Histology. 182 SEVENTEENTH Let us now examine the organ at the height of its activity in the body of the nursing woman (Fig. 161). The gland vesicles, rounded or elongated (o. 1128 to o. 1872 mm.), are formed by a membrana propria with fiat stellate cells. They have a simple lining of low cylinder cells (of mm.). Those finest se- cretory canals between the cells, which we have already mentioned at p. 134, have also been demon- strated here by means of injections. The excretory canal-work also has a cylindrical epithelium. How far the fatty secretion of our organ, the milk, depends upon the destruc- tion of the gland cell, or whether the latter structure does not simply express the produced or received fat substance from the membraneless, contractile cell-body—are questions which require more accurate investigation. In advanced life, the female mammary gland loses its secretory apparatus. It becomes reduced to the old canal- system of a long passed period of childhood (Langer). The colostrum (already mentioned at Fig. 124) contains, in addition to albuminous fat vesicles surrounded by a very thin envelope, gland cells and cell fragments, to mm. in size. The ordinary milk of a later period contains only the former elements, the so-called milk globules. The size of the latter varies from about to mm- Fig. 161.—Gland-vesicles of a nurs- ing woman, with cells and Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Frey, Heinrich, 1822-1890; Cutter, George R. (George Rogers), b. 1840, tr. New York, G. P. Putnams sons
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