<prompt> The couinauds segmental nomenclature is based on the position of theHepatic veins and poal veinHepatic veins and biliary ductsPoal vein and biliary ductsPoal vein and hepatic aery  <response>: Functional anatomy of the liver is based on couinauds division of liver into eight subsequently nine functional segments, based upon the distribution of poal venous branches and location of hepatic veins in the parenchyma Couinaud 1957 