REFLEX RESPONSES OF SINGLE RENAL SYMPATHETIC FIBRES TO STIMULATION OF ATRIAL RECEPTORS AND CAROTID BARO- AND CHEMORECEPTORS

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Abstract
Recordings were made of the discharge of single fibers from renal sympathetic efferent nerves in the anesthetized dog. Stimulation of left atrial receptors by distension of small balloons at the junctions of the pulmonary veins and the left atrium resulted in a reduction in the discharge of 1 group of these single fibers and no change in the discharge of a 2nd group of fibers. Bilateral occlusion of the common carotid arteries resulted in an increase in the discharge of all single fibers tested. All fibers tested which responded to stimulation of atrial receptors also responded to carotid occlusion. Results provide evidence for convergence of the central pathways from atrial receptors and baroreceptors on individual sympathetic efferent neurons.

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