HEPATIC SEGMENTS:

• On the basis of the intrahepatic distribution of the hepatic artery, the portal vein and the biliary ducts, the liver can be divided into right and left functional lobes.
•  These do not correspond to the anatomical lobes of the liver. 
• The physiological lobes are separated by a plane passing, on the antero- superior surface along a line joining the cystic notch to the grove for the inferior vena cava. On the inferior surface the plane passes through the fossa for the gall bladder and on the posterior surface it passes through the middle of the caudate lobe.