The Site of Impulse Generation in Transcranial Magnetic Stimulation of the Facial Nerve
| Autor: | Pekka Karma, Ilpo Rimpiläinen, T. Kuurne, G. Blomstedt, I. Pyykkö |
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| Rok vydání: | 1993 |
| Předmět: |
Adult
Male Meatus medicine.medical_treatment Posterior fossa Facial Muscles Stimulation behavioral disciplines and activities Reaction Time otorhinolaryngologic diseases Humans Medicine Latency (engineering) Evoked Potentials Aged Intraoperative Care business.industry Orbicularis oris muscle Neuroma Acoustic General Medicine Anatomy Middle Aged Transcranial Magnetic Stimulation Facial nerve Electric Stimulation Transcranial magnetic stimulation Facial Nerve Electrophysiology Otorhinolaryngology Female business psychological phenomena and processes Petrous Bone |
| Zdroj: | Acta Oto-Laryngologica. 113:339-344 |
| ISSN: | 1651-2251 0001-6489 |
| DOI: | 10.3109/00016489309135821 |
| Popis: | The facial nerve can be stimulated in its intracranial course through transcranial magnetic stimulation (TMS). We studied the site of impulse generation produced by TMS by comparing the latencies of the muscle evoked potentials (MEPs) elicited with TMS and intracranial electrical stimulation (IES) of the facial nerve during neurosurgical posterior fossa procedures. In a series of 25 patients, the mean latency of the TMS elicited MEPs, recorded in the orbicularis oris muscle, was 5.0 ms (SD 0.58). Also IES of the distal part of the facial nerve in the internal acoustic meatus showed a mean latency of 5.0 ms (SD 0.68). Proximal IES in the root entry zone of the facial nerve, and intermediate IES between root entry zone and meatus, produced MEPs with significantly longer latencies compared to TMS and distal IES (p < 0.05). The findings suggest that the TMS induced facial nerve activation, leading to a MEP response, takes place within the internal acoustic meatus. |
| Databáze: | OpenAIRE |
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