Applied anatomy of posterior Calot’s triangle and its clinical significance in laparoscopic cholecystectomyYOU Xiaogong*,SHI Baomin,JING Liyan,et al.*Taian Health School of Shandong Province，Taian 271000,China Corresponding author：SHI Baomin，Email:tawxyxg@163.com AbstractObjectiveTo investigate the structure of the posterior Calot's triangle sector and provide anatomic data of posterior Calot's triangle for laparoscopic cholecystectomy.MethodsFrom September 2005 to January 2008,the structure of posterior Calot’s triangle was observed by simulating the posterior Calot’s triangle approach of laparoscopic cholecystectomy in 81 samples of adult liver and gallbladder.ResultsPosterior Calot’s triangle was composed of the back wall of gallbladder neck,cystic duct,the upper section of common bile duct, and the facies visceralis of lobus hepatis dexter.The length of the ductus cysticus was (3018±219)mm and (302±036)mm in diameter(range from 232 to 398mm).It had either linear type or arcuate type.The mean diameter of the cystic artery was (168±035) mm (range from 080 to 378mm). Abnormality of cystic artery was observed posterosuperior to the posterior Calot’s triangle in 6 sample (74%) entering gallbladder from the back of neck and body of gallbladder.Cystic artery pass through the back of the cystic duct occurred in 8 samples (99%).Cystic artery pass through the front of the cystic duct occurred in 5 samples(6.1%).Accessory hepatic duct originated in the facies visceralis of lobus hepatis dexter was observed in 5 samples（61%）through the posterior Calot’s triangle entering common hepatic duct through the joint of cystic duct and common hepatic duct.ConclusionIdentification of posterior Calot's triangle and its bordering structures is beneficial to avoiding injuries of surrounding blood vessels and bile ducts during laparoscopic cholecystectomy