Which portal vein supplies the left lobe?

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At the porta hepatis, the portal vein splits into left and right branches that supply the liver lobes. The left portal vein feeds the left lobe, delivering nutrient-rich blood to that portion of the liver. The right portal vein serves the right lobe. The inferior vena cava and hepatic veins are involved in draining blood away from the liver, not providing its lobar supply. So the left portal vein is the vessel that supplies the left lobe.