In general, the extrahepatic biliary tract is composed of the common hepatic duct, common bile duct, and hepatopancreatic jugular. 1. Common hepatic duct: The right and left hepatic ducts from the liver converge to form the common hepatic duct. 2. Common bile duct: The common hepatic duct goes down to meet the cystic duct, and below the confluence, the common hepatic duct becomes the common bile duct. 3. Hepatopancreatic jugular: The common bile duct collects bile, including bile from the gallbladder and bile from the liver. After collection, the common bile duct continues downward to reach the upper edge of the duodenum, where it passes through the pancreatic tissues for a portion of its journey and joins the pancreatic duct in the pancreatic parenchyma. After the two ducts have converged, the lower end is known as the hepatopancreatic potbelly, and together they open into the duodenal papilla. If there are stones in the extrahepatic bile ducts described above, there is a risk of yellowing of the skin and sclera, as well as the appearance of itching of the skin.