Couinaud classified liver into 8 segments,which structure differentiates the segments anatomically
(A) Poal vein (B) Hepatic vein (C) Bile duct (D) Hepatic aery
(B) Ans. B. Hepatic veinThe Couinaud classification divides the liver into 8 functional segments.The hepatic veins are found at the periphery of each segment, whereas the center has branches of the poal veins, hepatic aeries, and bile ducts.The middle hepatic vein divides the liver into left and right lobes. The left hepatic vein divides the left lobe into lateral (2, 3) and medial (4a, 4b) segments. The right hepatic vein divides the right lobe into anterior (5, 8) and posterior (6, 7) segments. The caudate lobe (1) has hepatic veins that often drain directly into the IVC.