The development of the human body; a manual of human embryology . , Ductus Cuvieri; , ductus venosus; and ,right and left omphalo-mesenteric veins; and , rightand left umbilical veins.—(Hochstetter.) C). When these connections are complete, the upperportions of the umbilical veins degenerate (Fig. 149), andnow the right side of the lower of the two omphalo-mesen-teric loops which surround the intestine disappears, asdoes also that portion of the left side of the upper loopwhich intervenes between the middle cross-connection andthe ductus venosus, and so
The development of the human body; a manual of human embryology . , Ductus Cuvieri; , ductus venosus; and ,right and left omphalo-mesenteric veins; and , rightand left umbilical veins.—(Hochstetter.) C). When these connections are complete, the upperportions of the umbilical veins degenerate (Fig. 149), andnow the right side of the lower of the two omphalo-mesen-teric loops which surround the intestine disappears, asdoes also that portion of the left side of the upper loopwhich intervenes between the middle cross-connection andthe ductus venosus, and so there is formed from the om-phalo-mesenteric veins the vena porta. THE VEINS. 283 While these changes have been progressing the rightumbilical vein, originally the larger of the two (Fig. 148, Aand B, ), has become very much reduced in sizeand, losing its connection with the left vein at the umbili-cus, forms a vein of the ventral abdominal wall in whichthe blood now flows from above downward. The leftumbilical now forms the only route for the return of.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
