SPINAL VASOMOTOR REFLEXES ASSOCIATED WITH VARIATIONS IN BLOOD PRESSURE

Abstract

In the dog, deprived of the vascular zones in the aortic arch and the carotid sinuses, increase and decrease of the general blood pressure still cause, respectively, vasodilatation and vasoconstriction in the splanchnic circulation (spleen) and in the peripheral circulation (leg). These reactions persist after section of both vagus nerves or after complete section of the neck, but disappear after the acute destruction of the spinal cord or after total sympa-thectomy in the spinal dog. They are vasomotor reflexes produced, for the most part, by variations in the blood pressure in the organs supplied by the celiac and superior mesenteric arteries.