[Circulatory responses to selective stimulation of medullated and non-medullated fibers of the aortic nerve].

Circulatory responses to selective afferent stimulation of medullated and non-medullated fibers in the left aortic nerve were followed in terms of changes in arterial pressure, heart rate, contractile force of the left ventricular fragment and vascular resistance of the hind limb of cats with an opened thorax. Stimulation of the medullated afferents induced a reflex fall of blood pressure mainly by means of decrease in the peripheral vascular resistance, while activation of non-medullated fibers influenced the heart work, i. e. decreased heart rate and myocardial contractile force.