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Experimental Brain Research

, Volume 115, Issue 3, pp 381–386 | Cite as

Excitatory connections between neurons of the central cervical nucleus and vestibular neurons in the cat

  • H. Sato
  • T. Ohkawa
  • Y. Uchino
  • V. J. Wilson
RESEARCH ARTICLE

Abstract

 The central cervical nucleus (CCN) of the cat receives input from upper cervical muscle afferents, particularly primary spindle afferents. Its axons cross in the spinal cord, and while in the contralateral restiform body give off collaterals to the vestibular nuclei. In order to study the connections between CCN axons and vestibular neurons, we stimulated the area of the CCN in decerebrate cats while recording intra- or extracellularly from neurons in the contralateral vestibular nuclei. CCN stimulation evoked excitatory postsynaptic potentials (EPSPs) or extracellularly recorded firing in the lateral, medial and descending vestibular nuclei. The latency of EPSPs (mean 1.6 ms) was on average 0.4 ms longer than the latency of antidromic spikes evoked in the CCN by stimulation of the contralateral vestibular nuclei (mean 1.2 ms), demonstrating that the excitation was typically monosynaptic. The results provide further evidence that the CCN is an important excitatory relay between upper cervical muscle afferents and neurons in the contralateral vestibular nuclei.

Key words Central cervical nucleus Vestibular projection Cat 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1997

Authors and Affiliations

  • H. Sato
    • 1
  • T. Ohkawa
    • 2
  • Y. Uchino
    • 1
  • V. J. Wilson
    • 3
  1. 1.Department of Physiology, Tokyo Medical College, 6-1-1 Shinjuku, Shinjuku-ku, Tokyo 160, Japan; Tel.: +81-3-3351-6141 ext 323, Fax: +81-3-3351-6544JP
  2. 2.Department of Orthopedic Surgery, Tokyo Medical College, Tokyo 160, JapanJP
  3. 3.The Rockefeller University, New York, NY 10021, USAUS

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