What does each Couinaud segment have?

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In the Couinaud system, each liver segment is a discrete functional unit defined by its own vascular and biliary supply. A segment receives a dedicated branch of the portal vein and a corresponding branch of the hepatic artery, and it drains bile through its own segmental bile duct. The hepatic veins, while draining the liver, do not align strictly with a single segment the way the inflow and biliary drainage do; they collect from multiple segments. So the description that matches this anatomy is that every segment has its own portal vein, hepatic artery, and bile duct. The idea of shared vessels or no vessels doesn’t fit how the segments are organized and supplied.