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NEUROLOGY 1987;37:1417
© 1987 American Academy of Neurology

Cervical synapse-dependent somatosensory evoked potential following posterior tibial nerve Stimulation

Masud Seyal, MD, PhD, Louis W. Kraft, BS and Andrew J. Gabor, MD, PhD

Department of Neurology, University of California, Davis Medical Center, Sacramento, CA.

We have demonstrated the presence of a localized, synapse-dependent negativity (N29) recorded over the upper cervical spine after bilateral stimulation of the posterior tibial nerves at the ankle. The amplitude of N29 is maximal at the level of the second cervical spine and decreases at more rostral and caudal levels. The peak latency of N29 remains constant at all levels. N29 has a long refractory period when compared with the refractory period of the afferent volley recorded at either the sacral or thoracic level. N29 is most likely generated by activation of the nucleus gracilis by the afferent volley. The cervical N13 after median nerve stimulation probably has multiple generator sites, including the nucleus cuneatus.

Address correspondence and reprint requests to Dr. Seyal, Department of Neurology, University of California, Davis Medical Center, Sacramento, CA 95817.

Received June 23, 1986. Accepted for publication in final form November 6, 1986.




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