. A text-book of agricultural zoology. Zoology, Economic. 432 MAMMALIA. known as the decidua serotina (6), and that part of the uterine wall not related directly to the vesicle, the decidua vera (c). The chorion is directly attached to the decidua reflexa and serotina. The vascular connection between the reflexa and the chorion atrophies, whilst that between the serotina and the uv-. FlG. 205.—DiAGBAMMATIC SectIOIT OF PREGNANT HUMAN UTERUS WITH CONTAINED FCETUS. (Z, Allantoic stalk; uv, umbilical vesicle; am, aiunion; eft, chorion; b, decidua sero- tina ; c, decidua vera; /, decidua reflexa; F
. A text-book of agricultural zoology. Zoology, Economic. 432 MAMMALIA. known as the decidua serotina (6), and that part of the uterine wall not related directly to the vesicle, the decidua vera (c). The chorion is directly attached to the decidua reflexa and serotina. The vascular connection between the reflexa and the chorion atrophies, whilst that between the serotina and the uv-. FlG. 205.—DiAGBAMMATIC SectIOIT OF PREGNANT HUMAN UTERUS WITH CONTAINED FCETUS. (Z, Allantoic stalk; uv, umbilical vesicle; am, aiunion; eft, chorion; b, decidua sero- tina ; c, decidua vera; /, decidua reflexa; Fl, Fallopian tube; g, cervix uteri; a, fcetal villi of placenta; e, embryo. (From Huxley, after JJonget.) chorion increases, the villi becoming much branched and form- ing the chorion frondosum. This latter structure and the decidua serotina form the true placenta. This placenta is discoidal, but it is ventral, whereas the placenta of the rabbit is dorsal. At birth the placenta and the fused decidua vera and reflexa are all shed, and the ruptured blood-vessels of the uterine wall closed by its rapid contraction. 3. The zonary placenta.—Here the placenta is in the form of a broad band. The yolk-sac never fuses with the chorion. At first the allantois fuses with the sub-zonal membrane, at one. 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 Theobald, Frederick Vincent, 1868-1930. Edinburgh and London, W. Blackwood and sons
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1899
