The results of numerous clinical and morphological studies of the structures of the hepatobiliary zone indicate that the size and position of extrahepatic bile ducts have a significant variability. The localization and junction of ducts vary, but they are considered to be normal if they do not cause the development of pathological changes or processes. Among the variants described in the scientific literature are those that can be considered anomalies of development, because they are rarely found during examination. However, a number of authors believe that the anomalies of the location of bile ducts can be considered as an individual norm, if they do not disturb the passage of bile and do not cause pain, in particular - pain in humans. At the same time, most researchers indicate that localization and junction of extrahepatic bile ducts are especially important in the practice of abdominal surgeons. Their variability causes certain difficulties in surgery and can lead to the damage of ducts and vessels of the hepatic-duodenal ligaments. Medical statistics shows that over the last decades the amount of surgery on the bile ducts has steadily increased. The incidence of intraoperative bile duct injuries increased 5-fold after the introduction of laparoscopic technology and, according to various researchers, today ranges from 2 to 12%. Most commonly, with cholecystectomy, the common bile duct, right and left hepatic ducts are injured, which are cut during surgery, mistakenly considered as the bile duct. According to literature, no more than 48% of cases can be considered as a typical anatomy described in various manuals (the bubble duct enters the outer wall of the common hepatic duct at an angle). According to Ruge clinical classification there are 3 main types of fusion of the bladder duct with the common hepatic duct: the bladder duct falls into the right side of the hepatic duct at an acute angle; the long bubble duct passes parallel to the common hepatic one for 1 - 5cm; the bubble duct spirals away the common hepatic one and joins it along the back or the left side surface. In the remaining cases, there are single and pair additional segmental ducts, longer than usual common bile duct, deviation from the normal one; entrance of the bubble duct into the common bile duct. 20 tomograms of patients of both sexes (11 males, 9 females) of mature age without pathology of the hepatobiliary system on computed tomography Siemens Somatom Emotion 16 were analyzed. The conducted analysis of computed tomograms of organs of hepatobiliary zone allowed to investigate features of topography of extrahepatic bile ducts and to reveal 4 variants of entering the bladder duct into the common bile duct (the bubble duct entering the outer wall of the common liver duct at an angle, parallel location of the bubble duct, spiral position of the bubble ductentrance of the bubble duct into the right hepatic duct). Different variants of the development of the bladder duct can be effectively visualized using CT scan in c3Dcor mode. The analysis of morphometric indices of extrahepatic bile ducts according to the data of the processed CT examinations showed that in persons of different sexes of the mature age without pathology of the hepatobiliary system the length of the bubble duct varied within 7.3-42.71 mm. In women over 36 years the length of the bubble duct increases. Bubble duct is wider in females. With age, both in men and in women, the width of the bubble duct additionally increases on an average of 27.5% and 15% respectively. Entrance of the cystic duct into the common bile duct is characterized by significant variability and decreases with age in both men and women.