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Role of the nucleus vestibularis medialis in vestibulo-sympathetic response in rats

Pan Peisen, Zhang Yisheng, Chen Yizhang

Changhai Hosp., 2d Mil. Med. Univ.；2d Mil. Med. Univ.； Dept. Physiol., 2d. Mil. Med. Univ.

Abstract

Electrical stimulation of the vestibular nerve of rats anesthetized with #alpha#-chloralose and urethane elecited a distinct averaged response in the ipsilateral splanchnic nerve. With increasing the strength of stimulation, the amplitude of response was increased, but the laterncy was unchanged. By monitoring the lamellar field potentials in NVM and choosing the locus of phasereversal of field potential as the stimulating site, an averaged response in ipsi-splanchnic nerve with a latency of 32 ms was obtained, while the recorded splanchnic nerve response had a latency of 43 ms, when the vestibular nerve was stimulated. After electrolytic lesion of the rostral part of ipsi-NVM, the vestibulo-sympathetic response was significantly reduced. When a second lesion was placed in the caudal NVM, the response disappeared. Lesion in Deiters^ nucleus had no effect on the vestibulo-sympathetic response. The results suggest that NVM is a critical relay station in vestibulo-sympathetic response recorded in the splanchnic nerve.

Key words: Vestibulo-sympathetic response;Splanchnic nerve;Nucleus vestibularis medialis

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Citing This Article：

Pan Peisen, Zhang Yisheng, Chen Yizhang. Role of the nucleus vestibularis medialis in vestibulo-sympathetic response in rats. Acta Physiol Sin 1991; 43 (2): (in Chinese with English abstract).