Which two lobes are separated by the ligamentum venosum?

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The ligamentum venosum sits in a groove on the liver’s visceral surface and marks the boundary between the left lobe and the caudate lobe. It is the fibrous remnant of the fetal ductus venosus, running from the inferior vena cava toward the porta hepatis. Because the caudate lobe lies posteriorly near the IVC and the left lobe lies to the left of this fissure, they are the two lobes separated by this ligament. The right lobe lies away from this groove (anteriorly, separated from the left lobe by the falciform ligament), and the quadrate lobe lies near the porta hepatis, so they are not delineated by the ligamentum venosum.