Scheme of anastomosis between the portal, the upper and the lower hollow veinAnastomosis connection vessels by fistula, as well as artificially created or pathological fistula between the hollow organs (interventionists, gastrojejunostomy and others). Among vascular anastomoses systems distinguish between arterial, venous and lymphatic and arterio - venous anastomoses. Intersystem communications connect branches of the same vessel, interconnection anastomoses - nearby swimming-pools, for example portocaval anastomosis between the system of portal vein and the inferior Vena cava. In Fig. 1 shows the scheme of anastomosis between the portal, the upper and the lower hollow vein (1 - superior Vena cava; 2 - venous plexus of the esophagus; 3-portal vein; 4 - anastomoses on the back of the abdominal wall; 5 - the lower hollow vein; 6 - venous plexus rectum; 7 - anastomoses in the field of a front abdominal wall).
Arteriovenous anastomoses - fistula between the arteries and veins up to the disintegration into capillaries can be simple or complex; in particular, there are anastomoses containing epitelialnaScheme arterio-venous anastomoses in the skin fingertips glamurnye elements (winding up of vessels whose walls are composed of endothelial and richly innervated powerful layer epithelioid modified muscle cells), for example in the skin of the finger tips (Fig. 2), and anastomoses type of guard arteries in the lungs, pleura, the mesentery). Such anastomoses are involved in the regulation of the blood supply to organs, playing an important role in compensatory reactions of the organism. Sometimes anastomoses called connections between nerves.