A manual of human physiology, including histology and microscopical anatomy, with special reference to the requirements of practical medicine . posed circularly, and are permeatedexternally with elastic fibres, while in the finer ducts, there is a membraua propriacontinuous with that of the gland acini. The ducts are lined by cylindricalepithelium. 402 STRUCTURE OF THE MAMMA. During the first few days after delivery, the breasts secrete a small amount ofmilk of greater consistence, and of a yellow colour—the colostrum—in which large cells filled with fatty granules occur—the colostrum-corpuscl
A manual of human physiology, including histology and microscopical anatomy, with special reference to the requirements of practical medicine . posed circularly, and are permeatedexternally with elastic fibres, while in the finer ducts, there is a membraua propriacontinuous with that of the gland acini. The ducts are lined by cylindricalepithelium. 402 STRUCTURE OF THE MAMMA. During the first few days after delivery, the breasts secrete a small amount ofmilk of greater consistence, and of a yellow colour—the colostrum—in which large cells filled with fatty granules occur—the colostrum-corpuscles. Sometimes a nucleusis observable within them, and rarely theyexhibit amoeboid movements (Fig. 172, c, d, c).The regular secretion of milk begins after 3-4 was formerly supposed that the cells of theacini underwent a fatty degeneration, and thusproduced the fatty granules of the milk. It ismore probable, from the observations of Strieker,Schwarz, Partsch and Heidenhain, that the cellsof the acini manufacture the fatty granules, andtheir protoplasm eliminates them, at the sametime forming the clear fluid part of the Fig. 171. Acini of the mammary glandof a sheep during lactation—a, membrana propria; b,secretory epithelium. Changes during Secretion.—Partsch andHeidenhain found that the secretory cellsin the passive non-secreting gland (Fig. 172, I) were flat, polyhedral,and uni-nucleated, whilst the secreting cells (Fig. II) often con-
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectphysiology, bookyear1
