Fig. 28-5. The blood supply of the liver and the portal circulation, projected onto the visceral surface. In prenatal life, oxygenated blood from the placenta is carried by the left umbilical vein and ductus venosus to the inferior vena cava and right atrium. Postnatally, part of this pathway becomes the ligamentum teres and the ligamentum venosum. The alimentary canal is supplied by blood from the aorta (Ao.) and is drained by the portal vein (P.). The portal blood and that from the hepatic artery (H.) provide a double blood supply to the liver. The blood is distributed by sinusoids within the liver and is drained by the hepatic veins into the inferior vena cava. Click for high resolution image.