A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . artery and the aorta forms tlie duc-tus arteriosus, a veiy important fietal structure, as it en-ables the venous blood from the right side of the heart topass into the aorta without going through the lungs. Thegrowth of the liver has also been an important factor inbringing about modifications in the venous system. Withthe diminution of the umbilical vesicle the extra embry-onic portion of the omphalo-meseuterics disappears, butthe embryonic portions of the two vein
A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . artery and the aorta forms tlie duc-tus arteriosus, a veiy important fietal structure, as it en-ables the venous blood from the right side of the heart topass into the aorta without going through the lungs. Thegrowth of the liver has also been an important factor inbringing about modifications in the venous system. Withthe diminution of the umbilical vesicle the extra embry-onic portion of the omphalo-meseuterics disappears, butthe embryonic portions of the two veins form the portal 455 Cilgautisin. REFERENCE HANDBOOK OF THE MEDICAL SCIENCES. system. Oftire, to formcord. Tlic rimportant vimodifieil tlieleft one lier tlie two umbilical veins, the left persists en-tile single umbilical vein of the eml)ryo andight uiubilical vein degenerates into an un-ein. The presence of the liver has alsoproximal ends of the umbilical veins. The•omes divided into a capillary net, ?which. Fig. .5151.—Lateral View of a IJuman Embryo 11 mm. in Lengthand About Five Weeks Old. No. Jolms Hopkins UniversityCollection. (Enlaif^ed al)o«t 7 diameters.) The dissected area wasdrawn from a reconstruction. (After Bardeen and Lewis. I again collects into a short vein that opens into the sinusvenosus. The development of the ductus venosus soonforms a channel for most of the blood carried by the um-bilical vein. The pro.\inial portion of the inferior venacava is developed as a new structure. The distal end ofthis unites with the right inferior cardinal iu the regionwhere the renal arteries arise; and the caudal continu-ation of the cardinal from this point of imion becomesthe inferior portion of the vena cava. The remainingportions of the two cardinals form the azjgos veins. Across anastomosis develops from the left jugular to theright jugular, and from the common stem thus formeddevelops the superior vena cava. The proximal portionof the ductus Cuvieri on the
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