What are the two divisions of the right lobe?

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The right lobe is divided into anterior and posterior sectors. This division reflects how the liver’s internal branches of the portal and hepatic veins segment the lobe, which is the basis for functional anatomy rather than simple topographic halves. The anterior sector includes the more forward-facing parts (segments V and VIII), while the posterior sector comprises the parts toward the back (segments VI and VII). The boundary between them runs along a plane associated with the major venous drainage (roughly following the course of the middle and right hepatic veins). This anterior–posterior division is the standard way surgeons and radiologists describe subdivisions of the right lobe, whereas the other pairings (superior/inferior, medial/lateral, rostral/caudal) don’t align with how the liver is functionally organized.