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Am J Physiol Regul Integr Comp Physiol 261: R9-R13, 1991;
0363-6119/91 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 261, Issue 1 9-13, Copyright © 1991 by American Physiological Society

ARTICLES

Electrophysiological evidence of baroreceptor input to area postrema

S. Papas and A. V. Ferguson
Department of Physiology, Queen's University, Kingston, Ontario, Canada.

Subpopulations of rat area postrema (AP) and nucleus tractus solitarius (NTS) neurons exist that are responsive to changes in blood pressure. The hypothesis that these effects may be mediated by afferent baroreceptor input was examined. Orthodromic responses of AP and NTS neurons to aortic depressor nerve (ADN) stimulation were observed. Sixty-three percent of AP neurons were affected by ADN stimulation, with most exhibiting short-duration excitatory responses (latency, 27 +/- 1 ms; duration, 11 +/- 1 ms). Fifty-five percent of NTS neurons were influenced by ADN stimulation, although effects in this region were more heterogeneous (24% of neurons excited, 31% inhibited). Thus, in the rat, apparently both AP and NTS neurons receive afferent barosensory information.


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