<prompt> Valve of heister is seen inCystic ductCommon bile ductCommon hepatic ductPancreatic duct  <response>: Ans. is a i.e., Cystic ductThe mucous membrane of the cystic duct forms a series of 5-12 crescentic folds, arranged spirally to form the so called spiral valve of Heister. This is not a true valve.Also knowHamanns pouch - dilated posteromedial wall of neck of gall bladder.Sphincter choledochus - always present - terminal pa of bile ductSphincter pancreaticus - usually present - terminal pa of pancreatic ductSphincter ampullae of Oddi - surrounds the hepatopancreatic ampulla 