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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 common hepatic duct then joins the cystic duct coming from the gallbladder to form the common bile duct. The duct is usually 6â8 cm length and 6mm in diameter in adults.he common hepatic duct then joins the cystic duct coming from the gallbladder to form the common bile duct. The duct is usually 6â8 cm length and 6mm in diameter in adults.