part_of part of part of endoderm-derived structure sphincter muscle hepatopancreatic ampulla sphincter of hepatopancreatic ampulla http://upload.wikimedia.org/wikipedia/commons/4/43/Gray1057.png sphincter of ampulla of vater Oddi's sphincter uberon EMAPA:18663 UMLS:C0028872 MESH:D009803 Wikipedia:Sphincter_of_ampulla UBERON:0004915 NCIT:C13065 GAID:285 Muscular valve that controls the flow of digestive juices (bile and pancreatic juice) through the ampulla of Vater into the second part of the duodenum. Relaxed by the hormone Cholecystokinin (CCK) via vasoactive intestinal polypeptide (VIP).[WP]. FMA:15077 SCTID:181271000 musculus sphincter ampullae sphincter of Oddi hepatopancreatic ampullary sphincter gastrointestinal sphincter