. The elements of Embryology,. 124 THE THIRD DAY. Fig. 39. B. [chap. SuV-^. I Diagram of the Venous Circulation on the Third Day. II. Heart. Ductus Cuvieri. Meatus venosus. Su. V. Superior vertebral or anterior caniinal vein. C. Inferior or posterior cardinal vein. Of. Omphalo-mesaraic vein. laries in which these end are gathered into veins whidi unite to form two main trunks on either side, the cardinal veins, anterior and posterior (Fig. 23, Fig. 39 B, C), which run parallel to the long axis of the body in the upper part of the mesoblast, a little external to the protovert
. The elements of Embryology,. 124 THE THIRD DAY. Fig. 39. B. [chap. SuV-^. I Diagram of the Venous Circulation on the Third Day. II. Heart. Ductus Cuvieri. Meatus venosus. Su. V. Superior vertebral or anterior caniinal vein. C. Inferior or posterior cardinal vein. Of. Omphalo-mesaraic vein. laries in which these end are gathered into veins whidi unite to form two main trunks on either side, the cardinal veins, anterior and posterior (Fig. 23, Fig. 39 B, C), which run parallel to the long axis of the body in the upper part of the mesoblast, a little external to the protovertebrae. These veins, which have not by the third day attained to any great importance, unite opposite to the heart, on each side, into a short common trunk at right angles to themselves. The two short trunks thus formed, which bear the name of Ductus Cuvieri (Fig. 23, Fig. 39 B, ), running trans- versely straight inwards towards the middle line fall into the sinus venosus. The blood-vessels in the body of the embryo take their origin from the mesoblast exclusively, and their formation is probably precisely similar to that of the vessels in the vascular area, branches being given out from or brought into connection with the aorta and veins, in the same way as branches were described as springing from or meeting the earliest formed vas- cular channels. His, carrying out the views we have already referred to, believed that parablastic elements grew inwards along the omphalo-mesaraic trunks, through the length of the heart and so onwards into the aorta and all its branches, until. 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, Michael. London : Macmillan
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