[Neural apparatus of perirenal and parapancreatic tissues during human embryogenesis]

The neural apparatus of the perirenal and parapancreatic fat tissue has been studied in human embryos, fetuses and newborns. Neurohistological techniques of Bielshowsky--Gross, Bielschowsky--Boek, Rasskazova and Ranson have been used . During embryogenesis certain differences are being formed in the structure of neural elements. These differences are characteristic for mature specimens and are especially noticeable in the structure of receptor terminals and ganglia. The neural apparatus of the paranephric fat tissue is forming with greater speed. Neural elements in different parts of the perirenal and parapancreatic fat tissue are not evenly distributed. Their greatest concentration is noted behind the pancreatic head and tail and at the level of the renal inferior pole and hilus.