The biliary system is divided into two parts: the bile duct system and the gallbladder, which is divided into two parts: the intrahepatic bile duct and the extrahepatic bile duct. The intrahepatic bile duct is composed of capillary bile ducts, interlobular bile ducts, and the left and right hepatic ducts that gradually convergeThe extrahepatic bile duct consists of the common hepatic duct, the cystic duct, and the common bile duct.
In the latter classification, the gallbladder belongs to the extrahepatic biliary system.
Intrahepatic bile duct grading:
Grade 1: left and right hepatic ducts, about 25-4cm, traverse in the transverse groove of the hepatic hilum, the right side is about 1-3cm long, can penetrate deep into the liver parenchyma, and most of the left and right hepatic ducts are exposed on the surface of the liver parenchyma. Walks ventral to the left and right portal veins.
Secondary: interlobar bile duct, left lateral lobe, left inner lobe, right anterior lobe, right posterior bile duct.
*: Intersegmental bile duct, S1-S8 hepatic bile duct.
The common bile duct is about 7-8 cm long and 6-8 mm in diameter. More than 8 mm indicates dilation, 8-10 mm is mild, and more than 10 mm is significant dilation.
The common bile duct segment is divided into four segments. Common bile duct segmentation: upper duodenal segment (accompanied by hepatic artery and portal vein), posterior duodenal segment (inferior vena cava posterior and inferior), pancreatic segment (descending posterior or parenchymal of the pancreas), and internal duodenal wall segment (85% of the pancreatic duct confluent in this segment, 15% of the pancreatic duct and bile duct open in the middle and lower part of the descending duodenum, respectively).
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