. The elements of Embryology. Embryology. XL] THE CHORION, Fig. 117. 357. Diagrammatic Section of Pregnant Human Uterus with CONTAINED FcETUS. (From Huxley after Longet.) al. allantoic stalk; nb. umbilical vesicle; am. amnion; ch. cho- rion ; ds. decidua serotina; du. decidua vera; dr. decidua reflexa; I. fallopian tube ; c. cervix uteri; u. uterus ; z. foetal villi of true placenta; /. villi of non-placental part of chorion. The placenta has a somewhat discoidal form, with a slightly convex uterine surface and a concave embryonic surface. At its edge it is continuous both with the decidua ref
. The elements of Embryology. Embryology. XL] THE CHORION, Fig. 117. 357. Diagrammatic Section of Pregnant Human Uterus with CONTAINED FcETUS. (From Huxley after Longet.) al. allantoic stalk; nb. umbilical vesicle; am. amnion; ch. cho- rion ; ds. decidua serotina; du. decidua vera; dr. decidua reflexa; I. fallopian tube ; c. cervix uteri; u. uterus ; z. foetal villi of true placenta; /. villi of non-placental part of chorion. The placenta has a somewhat discoidal form, with a slightly convex uterine surface and a concave embryonic surface. At its edge it is continuous both with the decidua reflexa and decidua vera. Near the centre of the embryonic surface is implanted the umbilical cord. As has already been mentioned, the placenta is formed of the decidua serotina and the foetal villi of the chorion frondosum. The foetal and maternal tissues are far more closely united than in the placenta of the rabbit. The villi of the chorion, which were originally comparatively simple, become more and more complicated, and assume an extremely arborescent form. At birth the whole placenta, together with the fused de-. 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 Foster, M. (Michael), Sir, 1836-1907. London, MacMillan
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Keywords: ., bookautho, bookcentury1800, bookdecade1880, booksubjectembryology
