A textbook of obstetrics . e imbedded nucleiat irregular intervals(the syncytium). Bothof these layers are de-rived from the chorionand not from theuterine in embryonallife (the third month)the Langhans layerdisappears and thesyncytium remains asthe sole epithelialcovering of the uterine mucousmembrane at firstis richly supplied with capillar)- blood-vessels, from whichloops are thrown around the villi in such fashion as to form acomplex but very distinct network throughout the placentalmass. Later these capillaries disappear, and in their place areseen the large sin
A textbook of obstetrics . e imbedded nucleiat irregular intervals(the syncytium). Bothof these layers are de-rived from the chorionand not from theuterine in embryonallife (the third month)the Langhans layerdisappears and thesyncytium remains asthe sole epithelialcovering of the uterine mucousmembrane at firstis richly supplied with capillar)- blood-vessels, from whichloops are thrown around the villi in such fashion as to form acomplex but very distinct network throughout the placentalmass. Later these capillaries disappear, and in their place areseen the large sinuses or lacuna, to which blood is conveyed fromthe maternal circulation by little curling arteries that wind theirway up through the decidual cells and empty directly into theplacental sinuses. These arteries are provided with only a deli-cate endothelial wall. From Leopolds observations it appearsthat the arterioles of the decidua become more and more dis-tended as they approach the placental villi, so that their terminal. Fig. 84.—The capillary system of a placental villus(from Minot). ? 1 THE PLACENTA. 115
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Keywords: ., bookcentury1800, bookdecade1890, bookidtex, booksubjectobstetrics
