The extrahepatic biliary tract includes the gallbladder, common hepatic duct, cystic duct, right and left hepatic ducts, and common bile duct.
1. Gallbladder: It is a pear-shaped sac structure consisting of three layers: mucosa, muscularis propria, and tunica propria located in the gallbladder fossa under the right side of the ribs, which has the function of storing bile.
2. Common hepatic duct: It is a duct formed by the confluence of the left and right hepatic ducts, and joins with the cystic duct to form the common bile duct.
3. The cystic duct: It is a duct that connects the gallbladder to the common bile duct with a length of about 3 cm and a diameter of about 0.3 cm.
4. Left and right hepatic ducts: These ducts are composed of endothelium, epithelium, and muscularis propria, and are formed by the confluence of many interlobular bile ducts. It is an important conduit to and from the liver together with the portal vein and the hepatic artery.
5. Common bile duct: It is within 10mm in diameter. After the confluence of the common hepatic duct and the cystic duct, it extends to the duodenal papilla and is divided into four segments: the upper duodenal segment, the posterior duodenal segment, the pancreatic segment, and the duodenal intramural segment.
If any of the above tissues have problems, the patient should go to the Hepatobiliary Surgery Department of the regular hospital in a timely manner, complete the relevant examinations, make a clear diagnosis, and then take the appropriate treatment plan.