Where do intrasegmental portal triad vessels travel?

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The key idea is how the portal triad supplies the liver within its segmentation. Each hepatic segment has its own branch of the portal triad (portal vein, hepatic artery, and bile duct) that travels through the liver parenchyma from the periphery toward the center of that segment. In other words, intrasegmental vessels move centripetally, toward the center of the segment, as they distribute blood and bile within the segment’s territory and ultimately drain toward the central veins.

This inward course explains why the vessels are described as traveling within the lobes toward the center of each segment. They don’t run along the liver surface, nor do they primarily head toward the hilum (which is the broad entry/exit region at the liver’s edge) or into the gallbladder bed, which is a separate anatomical area.