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Am J Physiol Regul Integr Comp Physiol 240: R23-R28, 1981;
0363-6119/81 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 240, Issue 1 23-R28, Copyright © 1981 by American Physiological Society

ARTICLES

Depressor responses to stimulation of sympathetic afferents in monkeys and dogs

D. R. Kostreva, F. A. Hopp and J. P. Kampine

In dogs and monkeys anesthetized with pentobarbital sodium, stimulation of the cut central ends of the stellate cardiac nerve, the left and right anterior ansae subclavia, and the stellate ganglia resulted in a depressor response when stimulating fibers with conduction velocities in the range of 2.5-10 m/s. These afferents are in the A delta-fiber-type range. Pressor responses could be elicited by stimulating afferent fibers with conduction velocities in the range of 0.5-3.0 m/s. These fibers are in the C-fiber-type range. Stimulation of the abdominal sympathetic afferents always resulted in a depressor response regardless of the conduction velocities of the fibers. No changes in heart rate were observed. Bilateral cervical vagotomy did not alter the pressor or depressor responses.


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