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IVb Boundaries between IVa and IVb Boundaries between IVa and IVb Boundaries between IVa and IVb Boundaries between IVa and IVb THE END 。 Williams, 1995) Concept of Couinaud’s segment classification system ? The liver was divided into four segments by three vertical planes, and each segment was further subdivided into two subsegments by a transverse scissure. ? Each segment had a branch (or a group of branches) of the portal vein at its center and a tributary of a hepatic vein at its periphery 正中裂 portal fissure Couinaud’s system Couinaud’s system ? Basement: Distribution o