ABSTRACT
Liver is divided into left and right lobe and various segments depending on the vascular supply. It has a dual blood supply from the portal vein and the hepatic artery, both directing the blood toward the liver. Three hepatic veins drain the blood from the liver into IVC, exhibiting a trident appearance on USG.
Left hepatic vein: Divides left lobe into medial and lateral segments.
Middle hepatic vein: Separates left and right hepatic lobe, also separated by gallbladder (GB) fossa; courses within the main lobar fissure.
Right hepatic vein: Divides right lobe into anterior and posterior segments.
Quadrate lobe: Medial segment of left hepatic lobe. Located between round ligament and GB fossa.
Caudate lobe: First segment of liver; bounded anteriorly by ligamentum venosum and posteriorly by IVC. It has its own blood supply and drainage. Should not be mistaken for a lymph node.
