MORPHOGENESIS OF HUMAN BILE DUCTS IN EMBRYONIC PERIOD

Abstract

Numerous publications in scientific periodical press are indicative of an extraordinary interest of scientists in the issues of intrauterine morphogenesis. The study deals with the issue of prenatal morphogenesis of extrahepatic biliary ducts, since developmental defects of this segment of the digestive system constitute approximately 6-8 % out of all developmental defects. The objective of the study is to specify regularities of the spatial-temporal dynamics of the prenatal morphogenesis of the extrahepatic bile ducts. The investigation resulted in the following: the rudiment of the common bile duct in embryos of 4,0-5,0 mm of the parietococcygeal length is in the form of a hollow epithelial cord connecting the hepatic diverticulum with the ventral wall of the primary intestine. Physiological atresia of the common bile duct occurs in embryos of 8,5-11,0 mm of the parietococcygeal length due to intensive epithelial proliferation. Recanalization of the common bile duct is completed at the later stages of the intrauterine development.