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Dr Omar Bashir et al. The hepatic veins are three large veins which drain the hepatic parenchyma into the inferior vena cava (IVC), named the right hepatic vein, middle hepatic vein and left hepatic vein. The veins are important landmarks, running in between and hence defining the segments of the liver.
The hepatic vein subsequently drains into the inferior vena cava. The hepatic artery provides 30 to 40% of the oxygen to the liver, while only accounting for 25% of the total liver blood flow. The rest comes from the partially deoxygenated blood from the portal vein. The liver consumes about 20% of the total body oxygen when at rest. That is why the total liver blood flow is quite high, at about 1 litre a minute and up to two litres a minute. That is on average one fourth of the average cardiac output at rest. Large veins that are considered part of the portal venous system are the: 1  Hepatic portal vein. 2  Splenic vein. 3  Superior mesenteric vein. 4  Inferior mesenteric vein.