The diseases of the genital The diseases of the genital organs of domestic animals diseasesofgenita00will Year: 1921 Puerperal Diseases of the Uterus 56i fetal placental arteries, capillaries and veins escapes from the ruptured umbilic veins, causing the placental capillaries of the fetus to collapse, become greatly reduced in volume, and drop away from the capillaries of the maternal placental crypts. There was at no time any anatomical bond of union, but only an intimate contiguity maintained by a mutual at- traction existing between the healthy uterus and living fetal envelopes. When the
The diseases of the genital The diseases of the genital organs of domestic animals diseasesofgenita00will Year: 1921 Puerperal Diseases of the Uterus 56i fetal placental arteries, capillaries and veins escapes from the ruptured umbilic veins, causing the placental capillaries of the fetus to collapse, become greatly reduced in volume, and drop away from the capillaries of the maternal placental crypts. There was at no time any anatomical bond of union, but only an intimate contiguity maintained by a mutual at- traction existing between the healthy uterus and living fetal envelopes. When the umbilic cord ruptures and the chori- onic end is necrotic, the attraction between it and the uterus ceases. If it is to be retained, the retention is necessarily dependent upon a pathologic condition which can not develop after the expulsion of the fetus, whether alive or dead, but is dependent absolutely upon the persistence of a metritis which existed in the pregnant uterus. The expulsion of the fetus does not cause, nor permit other factors to cause, re- tention of the membranes, but fetal expulsion reveals the uterine disease and opens the way for important modifica- tions and complications in its course. The bovine placental structures are the most complex seen in domestic animals. While the placental system of the ewe Fig. 180—Retained Placenta showing- incarceration and disintegra- tion of the choriotic tufts ( fot 1 and extensive infiltration with leucocytes in the maternal portion, some of them already- broken down, x 310 1 After Pomayer). 36
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