What separates the anterior and posterior right-lobe segments?

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The right lobe is split into anterior and posterior sectors by a boundary that follows the right hepatic vein as it courses through the right hepatic fissure and drains into the IVC. This vein delineates the plane between the anterior sector (typically segments V and VIII) and the posterior sector (segments VI and VII). The left hepatic vein would separate left lobe portions, the portal vein divides by portal pedicles rather than creating an anterior/posterior division within the right lobe, and the inferior vena cava lies posterior to the liver rather than forming the segment boundary.