Which portal vein supplies the right lobe?

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The right portal vein. After the portal vein enters the liver at the porta hepatis, it divides into left and right branches. The right portal vein supplies the right lobe by giving branches to the right lobe’s segments (V–VIII), while the left portal vein supplies the left lobe (segments II–IV). The splenic vein is a major contributor to forming the portal vein (with the superior mesenteric vein), but it does not directly supply a liver lobe by itself.