Развитие венозного русла сфинктерных сегментов внепеченочных желчных протоков в пренатальном периоде

Abstract

Abstract Вackground: The study revealed a lack of scientific publications and contradictory information about the features of the blood supply to the extrahepatic bile ducts. Research of features of development and spatial structure of the veins of their sphincter segments will clarify part of the vascular component in the functioning of the locking device of the biliary system. Material and methods: The research was carried out on 104 series of histological sections of the specimens of human embryos, prefetuses, fetuses and newborns measuring from 4,5 to 370,0 mm of parieto-coccygeal length by means of the methods of anthropometry, morphometry, vascular injections, macroscopy, microscopy, graphical- and 3D-reconstructions, statistical analysis. Results: The sources of veins of the biliary system have been found on the specimens of embryos at the end of 4th – beginning the 5th weeks of development in the form of wide gaps outlined a number of nuclei. It has been detected that differentiation of the structure arteries and veins starts at the end of the embryonic – beginning the prefetal period. The structure of the veins is a tendency to exceed the diameter of the arteries in the early fetal period of prenatal development. Conclusions: The distinct character and angioarchitectonics differences in arterial and venous plexus in the sphincter segments of the biliary system has been clearly observed at the end of the fetal period of development and in newborns, which may indicate an important functional role of the vessels in activity of sphincters.