. The elements of embryology . Embryology. 284 THE SIXTH DAT. [chap. the heart by two main venous trunks, the superior (Fig. 58, J) and inferior (Fig. 58, 0) cardinal veins, joining on each side to form the short transverse ductus Cuvieri, both which in turn united with the sinus venosus close to the heart. As the head and neck continue to enlarge and the wings become developed, the single superior cardinal or jugular vein, as it is usually called (Figs. 89, 90, J), of each side, is joined by two new veins: the Fio. Diagram of the Venous Circulation at the Commencement OF THE Fifth Day. n
. The elements of embryology . Embryology. 284 THE SIXTH DAT. [chap. the heart by two main venous trunks, the superior (Fig. 58, J) and inferior (Fig. 58, 0) cardinal veins, joining on each side to form the short transverse ductus Cuvieri, both which in turn united with the sinus venosus close to the heart. As the head and neck continue to enlarge and the wings become developed, the single superior cardinal or jugular vein, as it is usually called (Figs. 89, 90, J), of each side, is joined by two new veins: the Fio. Diagram of the Venous Circulation at the Commencement OF THE Fifth Day. n. heart, ductus Cuvieri. Into the ductus Cuvieri of each side fall J. the jugular vein, W. the vein from the wing and C. the inferior cardinal vein. S. V. sinus venosus. Of. vitel- line vein. U. allantoic vein, which at this stage gives off branches to the body-walls. , inferior vena cava. I. liver. vertebral vein {8u. J. V.), bringing back blood from the head and neck, and the vein from the wing (W). The inferior cardinal veins have their roots in the Wolffian bodies; they become developed, pari passu,. 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; Balfour, Francis M. (Francis Maitland), 1851-1882; Sedgwick, Adam, 1854-1913; Heape, Walter, 1855-1929. London ; New York : Macmillan
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