. The elements of embryology . Embryology. IV.] THE VASCULAR SYSTEM. 91 In £ are seen in the diverging folds of the splanohnopleure the two vitelline veins (of) which will shortly iinite to form the ductus Transverse Section op an Embryo at the end of the Second Day passing through the Eegion of the Bulbus Arteriosus. (Copied from His.) M. medullary canal in the region of the hind brain ; V. anterior cardinal vein; Ao. Aorta; C/i. Notochord; cd. alimentary canal; H. Heart (bulbus arteriosus); Pp. Pleuroperitoneal cavity; am. amnion. In the vascular and pellucid areas, the formation
. The elements of embryology . Embryology. IV.] THE VASCULAR SYSTEM. 91 In £ are seen in the diverging folds of the splanohnopleure the two vitelline veins (of) which will shortly iinite to form the ductus Transverse Section op an Embryo at the end of the Second Day passing through the Eegion of the Bulbus Arteriosus. (Copied from His.) M. medullary canal in the region of the hind brain ; V. anterior cardinal vein; Ao. Aorta; C/i. Notochord; cd. alimentary canal; H. Heart (bulbus arteriosus); Pp. Pleuroperitoneal cavity; am. amnion. In the vascular and pellucid areas, the formation of â vascular channels with a subsequent differentiation into arteries, capillaries and veins, is proceeding rapidly. Blood-corpuscles too are being formed in considerable numbers. The mottled yellow vascular area becomes covered with red patches consisting of aggregations of blood-corpuscles, often spoken of as blood-islands. Round the extreme margin of the vascular area and nearly completely encircling it, is seen a thin red line, the sinus or vena terminalis (Fig. 36, Sv.). This will soon increase in size and importance. From the vascular and pellucid area several large channels are seen to unite and form two large 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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Keywords: ., bookcentury1800, bookdecade1880, bookpubli, booksubjectembryology
