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AJP - Regulatory, Integrative and Comparative Physiology, Vol 264, Issue 5 857-R866, Copyright © 1993 by American Physiological Society
ARTICLES |
S. Zhong, Z. S. Huang, G. L. Gebber and S. M. Barman
Department of Pharmacology/Toxicology, Michigan State University, East Lansing 48824-1317.
We studied the effects of brain stem and spinal lesions on the 10-Hz rhythms in left and right inferior cardiac sympathetic nerve discharge (SND) of baroreceptor-denervated, decerebrate cats. Unilateral medullary lesions [parasagittal section 1.5 mm lateral to midline, radiofrequency lesion of the rostral ventrolateral medulla (RVLM), or chemical inactivation (muscimol) of the RVLM] dramatically reduced the 10-Hz rhythmic discharges in the two nerves. Power in the 10-Hz band of ipsilateral inferior cardiac SND was reduced more than that in contralateral SND. In contrast, bilateral parasagittal medullary sections or microinjection of muscimol into the medullary raphe uniformly reduced the 10-Hz rhythmic discharges of both nerves. Unlike unilateral medullary lesions, rostral pontine or cervical spinal hemisection reduced the 10-Hz discharges of only the ipsilateral inferior cardiac nerve. The chemical inactivation experiments demonstrate that the 10-Hz rhythm in SND is dependent on medullary raphe and RVLM neurons. Moreover the experiments with unilateral lesions demonstrate a mutually facilitatory interaction of medullary circuits that are responsible for the 10-Hz rhythmic discharges in sympathetic nerves located on opposite sides of the body.
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X. Tang, A. R. Chander, and L. P. Schramm Sympathetic activity and the underlying action potentials in sympathetic nerves: a simulation Am J Physiol Regulatory Integrative Comp Physiol, December 1, 2003; 285(6): R1504 - R1513. [Abstract] [Full Text] [PDF]
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 S. M. Barman, G. L. Gebber, and H. Kitchens Rostral dorsolateral pontine neurons with sympathetic nerve-related activity Am J Physiol Heart Circ Physiol, February 1, 1999; 276(2): H401 - H412. [Abstract] [Full Text] [PDF]
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