Circulatory responses to selective activation of myelinated and unmyelinated fibers of the aortic nerve
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In experiments on thoracotomized cats the arterial blood pressure (BP), cardiac frequency, force of contraction of a fragment of the left ventricle, and the resistance of the blood vessels of the hind limb were recorded. Myelinated and unmyelinated fibers (A and C fibers) of the left aortic nerve were stimulated selectively. Lowering of BP in response to stimulation of A fibers was observed to take place mainly through a decrease in the peripheral vascular resistance, whereas during excitation of C fibers the cardiac component of the reflex — a reduction in the frequency and force of cardiac contractions — was most marked.
Key wordsnervous regulation of the circulation myelinated and unmyelinated fibers vascular baroreceptors
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