[Regulatory muscular structures of the cerebral and renal arteries in different regimens of blood circulation].

The aim of this study was to summarize the regularities of location and structure of regulatory muscular structures in cerebral and renal arterial vascular bed in different hemocirculation regimens. The arterial vessels of brain and kidneys were studied in 10 dogs of control group and in 20 animals with experimental hyper- and hypotension caused by the modeling of coarctation of the aorta. Histological, histochemical and histoenzymological methods were used. It was established that in the arteries of organs studied in different hemocirculation regimens resulting from a modeled defect, the complex of uniform muscular structures was formed that included polypoid cushions, muscular-elastic sphincters, bundles of intimal musculature. These structures have some peculiarities of localization in distributive and resistive vessels and are found in the areas of arterial bifurcations. The results obtained suggest that these structures play an active role in the regulation of cerebral and renal hemodynamics.