The<unk>  regulates the secretion of pancreatic juice and bile into the duodenum. It also prevents reflux of duodenal contents into the ampulla of Vater. The<unk>  is relaxed by the hormone cholecystokinin via vasoactive intestinal peptide.
Sphincter of Oddi
Ileo-anal pouch
Album graecum
Megaduodenum
Gumma 
Gastric mucosa
Collyrium
Epigastrium