. A treatise on obstetrics for students and practitioners . Embryo with vitelline membrane, amnion,and allantois. Fifteen days. (Coste.)a. Abdominal stalk (allantois) with vesselsof chorion (ch). 6. Aorta, c. Heart, d. Borderof abdominal opening, e, (Esophagus. /.Primitive arches, i. Intestine, m. Omphalo-mesenteric artery, n. Ompbalo-mesentericvein. o. Vitelline membrane, u. Amnion, ah. Cavity of Same embryo magnified. Vitellinemembrane Abdominal stalk (allantois). b. Aorta,c. Heart, g. Aorta. /;, n. Umbilical andomphalo-mesenteric vessels emptying intoheart, i.
. A treatise on obstetrics for students and practitioners . Embryo with vitelline membrane, amnion,and allantois. Fifteen days. (Coste.)a. Abdominal stalk (allantois) with vesselsof chorion (ch). 6. Aorta, c. Heart, d. Borderof abdominal opening, e, (Esophagus. /.Primitive arches, i. Intestine, m. Omphalo-mesenteric artery, n. Ompbalo-mesentericvein. o. Vitelline membrane, u. Amnion, ah. Cavity of Same embryo magnified. Vitellinemembrane Abdominal stalk (allantois). b. Aorta,c. Heart, g. Aorta. /;, n. Umbilical andomphalo-mesenteric vessels emptying intoheart, i. Bovvel. o. Umbilical vesicle, , t. Anterior cranium, u. Ure-ters, v. Amnion, x. Bowel. The first form of the heart is that of a simple tube, one end of whichjoins the arterial system of the embryo, while the other connects withthe venous system of the yolk-substance. Next in interest and impor-tance to the primitive heart and its vessels may be considered theprimitive kidney, often termed the Wolffian body ; this is a series oftubules arising from a primitive ridge, called the Wolffian or nephridialridge, located in the embryo just outside of the genital ridge beforereferred to. From the tubules of the Wolffian body are graduallydeveloped the kidney and also the ducts of Midler, from which arefinally developed the female genital organs. As we have already seen,the primitive epithelia from which
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectobstetrics, bookyear1
