Abstract
Since the 10-Hz rhythmic activity in the sympathetic nerves was reported only in cats, we examined whether the activity of the same frequency could be observed in rats and rabbits as well as in the cats. Histograms of inter-burst-peak intervals of discharges of the renal nerves revealed that the 100 ms interval activity, the reverse of the 10-Hz, was observed in all the three mammals, of which the baroreceptor afferents were intact or inactivated. Further, the same frequency activity could be evoked by intermittent electrical stimulation of the dorsolateral funiculus of the cervical cord in spinal animals. It was suggested that the 10-Hz rhythmic activity in the sympathetic nerves was a common phenomenon throughout mammals and this activity was produced in the spinal cord. The physiological significance of the 10-Hz activity in the sympathetic nerves was discussed.
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