The development of the human body; a manual of human embryology . Fig. 11.—Ovary op a Woman Nine-teen Years op Age, Eight Daysafter Menstruation. d, Blood-clot; /, Graafian follicle; th,theca.—(Kollmann.) THE CORPUS LUTEUM. 41 the rapidity with which the various stages of retrogressionensue differs greatly according to whether pregnancyoccurs or not, and it is customary to distinguish the cor-pora lutea which are associated with pregnancy as corporalutea vera from those whose ova fail to be fertilized andwhich form corpora lutea spuria. In the latter the retro-. Fig. 12.—Section through the Co
The development of the human body; a manual of human embryology . Fig. 11.—Ovary op a Woman Nine-teen Years op Age, Eight Daysafter Menstruation. d, Blood-clot; /, Graafian follicle; th,theca.—(Kollmann.) THE CORPUS LUTEUM. 41 the rapidity with which the various stages of retrogressionensue differs greatly according to whether pregnancyoccurs or not, and it is customary to distinguish the cor-pora lutea which are associated with pregnancy as corporalutea vera from those whose ova fail to be fertilized andwhich form corpora lutea spuria. In the latter the retro-. Fig. 12.—Section through the Corpus Luteum of a Rabbit,Seventy Hours post cavity of the follicle is almost completely filled with lutein cells,among which is a certain amount of connective tissue, g, Blood-vessels; ke, ovarial epithelium.—(Sobotta.) gression of the follicle is completed usually in about threeweeks, while the corpora vera persist throughout the en-tire duration of the pregnancy and complete their retro-gression after the birth of the child. 4 42 THE DEVELOPMENT OF THE HUMAN BODY. Two very different views are held as to the origin of thelutein cells. According to one, which may be termed vonBaers view, the cells of the stratum granulosum remain-ing in the follicle rapidly undergo degeneration and com-pletely disappear, and the lutein cells and connective-tissue trabeculae are formed entirely from the cells of thetheca interna, which increase rapidly both in size andnumber. The other view was first advanced by Bischoffand may be known by his name. It is to
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
