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血管在胆道壁内的分布经组织学方法观察表明由浅至深可分为３层；外膜层血管、肌层或致密结缔组织层血管、粘膜层血管。肝外胆道各段壁内血管的形态特点不尽相同。体视学计量证实，各段微血管的长度密度、表面积密度差异存在显著性，其中胆囊和胆囊管壁血管配布最丰富，胆总管胰段和壁内段次之，而胆总管十二指肠后段、上段和肝总管段则较差。探讨了肝外胆道各段血供的配布与临床意义
The distribution of blood vessels in the biliary wall by histological observation showed that from shallow to deep can be divided into three layers; epicardial vascular, muscular layer or dense connective tissue vascular, mucosal layer of blood vessels. Extrahepatic bile duct wall morphological features vary. Stereological measurement confirmed that there was significant difference in the length density and surface area density of each segment of the microvessels, in which the blood vessels of the gallbladder and the cystic duct were the most abundant, followed by the pancreatic segment and intramural segment of the common bile duct, while the common bile duct duodenum Section, the upper segment and the hepatic duct segment is poor. The distribution and clinical significance of blood supply in extrahepatic biliary tract were discussed