What does the main lobar fissure separate?

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The main lobar fissure marks the boundary between the two major functional lobes of the liver. It is a deep groove on the visceral surface that runs from the fissure for the ligamentum teres (round ligament) to the porta hepatis, and it separates the right hepatic lobe from the left hepatic lobe. The other structures mentioned (caudate and quadrate lobes) sit in different regions and are not delineated by this fissure, and “superior” and “inferior” aren’t standard hepatic divisions. So the main lobar fissure defines the separation between the right and left hepatic lobes.