What portal vessel passes centrally within the right-lobe segments?

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Portal venous anatomy in the liver involves the main portal vein splitting into right and left branches that run within their respective lobes. The right portal vein travels through the right lobe, giving branches to the right-lobe segments, so it passes centrally within the right-lobe segments. The left portal vein serves the left lobe, not the right. The portal vein trunk is the original vessel before division at the porta hepatis, not a courseing vessel inside a specific lobe. The superior mesenteric vein is a major contributor to the portal system outside the liver and does not course through the liver as a right-lobe conduit.