A surgeon excises a poion of liver to the left of the attachment of the falciform ligament. The segments that have been resected are:

C i.e. 2 and 3- The poion of liver on the left side of falciform ligament is left (anatomical) lobe of liver. And in Couinaud's functional segmentation of liver, the segment number 2, 3, 4a and 4b form the left liver lobeQ.- Segmentation of Couinad's - French - system is based on hepatic vein (mainly) & poal veinQ . This devides liver into 8 segments. Each segment contains branch of poal vein, hepatic aeriole & bile duct.Right lobe of liver consists of segments 5, 6, 7, 8.The left hepatic duct drains segment 2, 3 & 4Q. And the right hepatic duct drains segments 5, 6, 7 and 8Q. And caudate lobe or segment I is drained by both right & left hepatic ductsQ.