Which statement correctly identifies intrasegmental vessels?

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In the liver, each segment has its own blood supply and drainage organized around the portal triad. The vessels inside a segment are the portal vein branches and, with them, the hepatic artery branches that run together with the bile duct within that segment. These vessels stay within the boundaries of the segment, providing perfusion to that specific area, which is why they’re described as intrasegmental vessels. The portal triad literally represents this group of structures traveling together in the same connective tissue pocket inside the segment.

Hepatic veins, on the other hand, drain blood from the segments and run along the borders between segments toward the inferior vena cava, so they aren’t intrasegmental. Bile ducts are part of the portal triad but are ducts, not vessels, so they don’t fit the “vessels” label as the primary intrasegmental components.