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The cystic duct is the short duct that joins the gallbladder to the common bile duct. It usually lies next to the cystic artery. It is of variable length. It contains 'spiral valves of Heister,' which do not provide much resistance to the flow of bile.
The cystic duct has an important anatomical feature. The mucous membrane of this duct is raised to form a spiral fold that is continuous with a similar fold in the neck of the gallbladder. This fold is commonly known as the âspiral valveâ and its function is to keep the lumen of the duct constantly open.t is about 1.5 inches long and connects the neck of the gallbladder to the common hepatic duct to form the common bile duct.