. A treatise on obstetrics for students and practitioners . Embryo of thirteen to fourteen days.(Schultze.) 1. Mid-brain. 2. After-brain. 3. Cere,bellum. 4. Amnion. 5 and 7. Neuralcanal. 6. Primitive Trace. 8. Oral cavity. 10. Heart. 11. Vitellinecanal. 12. Vitellene membrane. 13. Bor-der of medullary plate. 14. Allantois. 70 PREGNANCY AND LABOR. dilating, and in the latter by increasing the thickness of the vessel-wall-Both bloodvessels develop by the multiplication of cells within thewalls. The nucleated red blood-cells are the only corpuscles found atthe end of the first month
. A treatise on obstetrics for students and practitioners . Embryo of thirteen to fourteen days.(Schultze.) 1. Mid-brain. 2. After-brain. 3. Cere,bellum. 4. Amnion. 5 and 7. Neuralcanal. 6. Primitive Trace. 8. Oral cavity. 10. Heart. 11. Vitellinecanal. 12. Vitellene membrane. 13. Bor-der of medullary plate. 14. Allantois. 70 PREGNANCY AND LABOR. dilating, and in the latter by increasing the thickness of the vessel-wall-Both bloodvessels develop by the multiplication of cells within thewalls. The nucleated red blood-cells are the only corpuscles found atthe end of the first month in the embryos life. They gradually dis-appear, until, at the end of the third month, they are almost entirelyabsent. Among the many theories regarding the origin of the red blood-corpuscles that of Schafer may be quoted, who believes that they origi-nate from the protoplasm of the cells which form the bloodvessels. Fig. 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 amnion.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectobstetrics, bookyear1
