part_of part of has part develops from biliary tree A complex network of conduits that begins with the canals of Hering (intralobar bile duct) and progressively merges into a system of interlobular, septal, and major ducts which then coalesce to form the extrahepatic bile ducts, which finally deliver bile to the intestine, and in some species to the gallbladder. biliary tract interlobular bile duct intralobular bile duct biliary system bile duct extrahepatic bile duct endoderm-derived structure biliary bud digestive system element