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The fetus is supplied by oxygenated blood via two umbilical veins; the right umbilical vein regresses in late fetal life. The left vein persists to enter the abdomen via the umbilicus. It first travels to the liver within the falciform ligament. Before reaching the porta hepatis, it gives off several small branches which mainly enter the left lobe of the liver.
Within the porta hepatis, the left umbilical vein joins the left branch of the portal vein to form the ductus venosus. The ductus venosus joins the inferior vena cava having crossed the inferior surface of the liver within layers of lesser omentum. On route, it is joined by the left hepatic vein.
Hence, blood from the umbilical veins may take one of several routes through the liver: