lobe of liver left lobe of liver lobus hepaticus sinister left hepatic lobe lobus hepatis sinister The left lobe is smaller and more flattened than the right. It is situated in the epigastric and left hypochondriac regions. Its upper surface is slightly convex and is moulded on to the diaphragm; its under surface presents the gastric impression and omental tuberosity. [WP,unvetted]. left liver lobe liver left lobe