The application of Calot's triangle in the laparoscopic cholecystectomy

OBJECTIVETo investigate the microstructure of the Calot's triangle sector,and analyze its important construction with quantization and provide its anatomic basis for the laparoscopic cholecystectomy.METHODSThe microdissection for the Calot's triangle sector was perfromed in 26 of antiseptic cadaveric specimens to be observed the distribution of cystic ducts and blood vesseles as well as its relations with the adjacent structures.RESULTSThe length and diameter of ductus cysticus was(31.12±1.16)mm,and(3.12±0.26)mm,repectively.The length of vertical line segment from confluence of the left and right hepatic duct to surface of the liver was(12.26±1.18)mm,of the left hepatic duct was(16.26±1.42)mm,and of the right hepatic duct was(8.86±0.72)mm.Few confluence of the left and right hepatic duct was inner of the liver.The cystic artery's origin may come from the proper hepatic artery,the right hepatic artery,the left hepatic artery or the gastroduodenal artery.The right hepatic arteria can pass through the Calot's triangle and can also pass through the front or the back of the common hepatic duct.The diameters of cystic artery and right branch of proper hepatic artery were(1.68±0.40)mm and(3.20±1.50)mm,respectively.There were 1 or 2 of cystic lymph node in the Calot's triangle,and the diameter of that was(3.32±0.26)mm.CONCLUSIONThe terminus a quo,branch and courser of cystic artery have variations,and the ductus cysticus have different lengths,caliberes and diverse patterns.Therefore,at the laparoscopic cholecystectomy,it should be careful identification of the relations and anatomical characteristics between the ductus cysticus,common hepatic duct and bile duct in order to prevent the damages of tissue structures in the Calot's triangle sector.