part of part of develops from develops from liver primordium septum transversum endodermal part of digestive tract embryonic tissue epithelial sac hepatic diverticulum http://upload.wikimedia.org/wikipedia/commons/4/4f/Gray1088.png diverticulum hepaticum XAO:0000101 liver diverticulum UBERON:0008835 Wikipedia:Hepatic_diverticulum EHDAA:1530 AAO:0011057 NCIT:C34187 EHDAA2:0000740 uberon 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. The caudal part of the septum transversum is invaded by the hepatic diverticulum which divides within it to form the liver and thus gives rise to the ventral mesentery of the foregut. in mice, the hepatic diverticulum forms by E9 and expands into an obvious liver bud by E10 UMLS:C1512407 epithelium of foregut-midgut junction digestive tract diverticulum