0rgans Liver (Sections)

Right Lobe Segment 1

Unit I is the caudate lobe and is situated posterior l and it may receive its supply from both the right and the left branches of portal vein. It contains one or more hepatic veins which drain directly into the IVC.

Right Lobe Segment 2

Segment II above and segment III below the portal plane. units II and III lie medial to the falciform ligament with II superior to the portal venous supply and III inferior.      Source

Right Lobe Segment 3 

Segment II above and segment III below the portal plane. units II and III lie medial to the falciform ligament with II superior to the portal venous supply and III inferior.      Source

Right Lobe Segment 4

Segment IVa above and segment IVb below the portal plane. unit IV lies lateral to the falciform ligament and is subdivided into IVa (superior) and IVb (inferior).      Source

Left Lobe Segment

Unit I is the caudate lobe and is situated posterior l and it may receive its supply from both the right and the left branches of portal vein. It contains one or more hepatic veins which drain directly into the IVC.

Left Lobe Segment 2

Segment II above and segment III below the portal plane. units II and III lie medial to the falciform ligament with II superior to the portal venous supply and III inferior.       Source

Left Lobe Segment 3

Segment II above and segment III below the portal plane. units II and III lie medial to the falciform ligament with II superior to the portal venous supply and III inferior.     Source

Left Lobe Segment 4

Segment IVa above and segment IVb below the portal plane. unit IV lies lateral to the falciform ligament and is subdivided into IVa (superior) and IVb (inferior).          Source