part_of part of develops from liver primordium septum transversum endodermal part of digestive tract embryonic tissue foregut-midgut junction epithelial sac hepatic diverticulum An out-pocket of thickened ventral foregut epithelium adjacent to the developing heart. Constitutes the first morphological sign of the embryonic liver. The anterior portion of the hepatic diverticulum gives rise to the liver and intrahepatic biliary tree, while the posterior portion forms the gall bladder and extrahepatic bile ducts. diverticulum hepaticum liver diverticulum epithelium of foregut-midgut junction digestive tract diverticulum