What separates the caudate lobe from the left lobe?

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The boundary between the caudate lobe and the left lobe is defined by the fissure for the ligamentum venosum, which marks the remnant of the ductus venosus along the visceral surface. This groove runs between these two lobes, separating them.

Other structures have different roles: the falciform ligament lies on the diaphragmatic surface and divides the right and left lobes there, not along the caudate-left border; the coronary ligaments are peritoneal reflections around the liver’s bare area and do not delineate lobar borders; the round ligament (ligamentum teres) is the remnant of the obliterated umbilical vein within the edge of the falciform ligament and isn’t a boundary between the caudate and left lobes.