Intracranial recording from the brain-stem and the trigeminal nerve following upper lip stimulation |
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| Affiliation: | 1. Key Laboratory of Horticultural Plant Biology (Ministry of Education), College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan 430070, China;2. Guangxi Key Laboratory of Citrus Biology, Guangxi Academy of Specialty Crops, Guilin 541004, China;3. University of Florida, Citrus Research and Education Center, 700 Experiment Station Road, Lake Alfred, FL 33850, USA;1. Department of Physics, Razi University, Kermanshah, Iran;2. Department of Physics, University of Missouri, Columbia, MO 65201, USA;3. Department of Physics, University of Colorado, Colorado Springs, CO 80918, USA;1. UCM Digestive Diseases and CIBEREHD, Virgen del Rocío Univdersity Hospital, Institute of Biomedicine of Seville, Seville, Spain;2. Department of Medicine, University of Seville, Seville, Spain |
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| Abstract: | 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 pons 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. |
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