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Japanese

Transcranial Magnetic Stimulation of the Facial Nerve : Identification of the Actual Excitation Site in the Cat Kazuhiro Gotoh 1 , Takayuki Ohira 1 , Jun Namiki 1 , Yasuhiko Ajimi 1 , Mami Ishikawa 1 , Ryuzo Shiobara 1 , Shigeo Toya 1 , Moriichiro Takase 2 1Departments of Neurosurgery, Keio University School of Medicine 2Departments of Clinical Electroencephalography, Keio University School of Medicine Keyword: facial nerve , magnetic stimulation , cat pp.655-660
Published Date 1993/7/1
DOI https://doi.org/10.11477/mf.1406900509
  • Abstract
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The site where transcranial magnetic stimulation excites the facial nerve was studied in 6 cats. Trans-cranial magnetic stimulation of the facial nerve was recorded from the left mentalis muscle. A figure-of -eight shaped magnetic coil was used, and coil induction direction had more influence on the facial nerve evoked compound muscle action potentials (CMAPs) than the coil position.

No change could be detected in the CMAPs before and after craniotomy, after cerebellar lobectomy and after exposure of the facial nerve in the facial canal. The facial nerve was stimulated electrically at the porus, meatal portion, geniculum and horizon-tal portion. The latencies of the CMAPs for each portion were measured and compared with the magnetic response, which was coincidental with that of the meatal portion.

The facial nerve was then transected distally from the porus, and CMAPs following magnetic stimulation were recorded at each step. The CMAPs disappeared when the nerve was transected at the fundus.

The results of both approaches in this study led to the conclusion that transcranial magnetic stimula-tion excites the facial nerve at the meatal portion.


Copyright © 1993, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 2185-405X 印刷版ISSN 0006-8969 医学書院

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