What does the main lobar fissure run between?

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The main lobar fissure is a visceral-surface landmark that marks the boundary between the liver’s left and right lobes. It runs as a groove from the neck of the gallbladder to the right portal vein at the porta hepatis. This orientation helps orient the liver during dissection and ultrasound, since the gallbladder neck sits near the fissure and the right portal vein lies within the right lobe. The other structures listed do not define this fissure: the path is specifically toward the right portal vein, not the common hepatic duct or the left hepatic vein.