The development of the human body; a manual of human embryology . Mc 154 THE PLACENTA. I 55 ence between it and the vera, in that, being concernedwith the nutrition of the embryo, it does not partake ofthe degeneration noticeable in the other decidual, butpersists until birth, forming a part of the structure termedthe placenta. The Placenta.—This organ, which forms the connectionbetween the embryo and the maternal tissues, is composedof two parts, separated by the intervillous space. Oneof these parts is of embryonic origin, being the chorionfrondosum, while the other belongs to the maternal t
The development of the human body; a manual of human embryology . Mc 154 THE PLACENTA. I 55 ence between it and the vera, in that, being concernedwith the nutrition of the embryo, it does not partake ofthe degeneration noticeable in the other decidual, butpersists until birth, forming a part of the structure termedthe placenta. The Placenta.—This organ, which forms the connectionbetween the embryo and the maternal tissues, is composedof two parts, separated by the intervillous space. Oneof these parts is of embryonic origin, being the chorionfrondosum, while the other belongs to the maternal tissuesand is the decidua serotina. Hence the terms placentafaetalis and placenta uterina frequently applied to the twoparts. The fully formed placenta is a more or less dis-coidal structure, convex on the surface next the uterinemuscularis and concave on that turned toward the em-bryo, the umbilical cord being continuous with it near thecenter of the latter surface. It averages about cm. inthickness, thinning out somewhat toward the edges, andhas a diamet
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
