Intracranial recording from the brain-stem and the trigeminal nerve following upper lip stimulation

J. F. Soustiel, A. V. Chistyakov, H. Hafner, E. Youssim, M. Feinsod

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Short latency evoked potentials following stimulation of the upper lip were recorded intracranially during neurosurgical procedures in 14 patients. In 10 patients, a suboccipital craniectomy provided direct access to the trigeminal root and the pens at the root entry zone. Direct recordings from the trigeminal root were characterized by a large triphasic potential at 2.4-2.7 msec. The latency of this potential increased as a result of moving the recording electrode proximally towards the brain-stem. The same potential could be recorded from the brain-stem surface at a latency suggesting an intra-axial presynaptic origin. A second component, N4.7, was recorded from over the most rostral aspect of the brain-stem in 3 patients and from the tentorium free edge in 4 patients. This potential of smaller amplitude did not show significant difference in latency or polarity at various electrode locations, suggesting a deep diencephalic origin remote from the recording electrode.

Original languageEnglish
Pages (from-to)51-54
Number of pages4
JournalElectroencephalography and Clinical Neurophysiology - Evoked Potentials
Issue number1
StatePublished - Jan 1996
Externally publishedYes


  • Brain-stem evoked potentials
  • Intracranial recording
  • Trigeminal evoked potentials
  • Upper lip stimulation


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