Early scalp responses evoked by stimulation of the supraorbital nerve in man |
| |
| Affiliation: | 1. Hospital Universitario de Canarias, Department of Neurosurgery, S/C de Tenerife, Spain;2. Hospital Universitario de Canarias, Intraoperative Neurophysiologic Monitoring Unit, S/C de Tenerife, Spain;1. Petru Poni Institute of Macromolecular Chemistry of the Romanian Academy, Iasi, Romania;2. Biological Research Institute, Iasi, Romania;1. Department of Neurosurgery, Komagome Metropolitan Hospital, 3-18-22 Hon-komagome, Bunkyo-ku, Tokyo 113-8677, Japan;2. Department of Psychology, Chuo University of Literature, 742-1 Higashi-nakano, Hachioji City, Tokyo 192-0393, Japan;1. Complejo Asistencial Universitario de León, Altos de Nava s/n, León 24008, Spain;2. Hospital Universitario de Canarias, San Cristóbal de la Laguna, Spain;3. Hospital Universitario Rio-Hortega, Valladolid, Spain;4. Hospital Universitario de Bellvitge, Hospitalet de Llobregat, Spain;1. Department of Psychology, Christian-Albrechts-University Kiel, Olshausenstrasse 62, 24118 Kiel, Germany;2. Department of Neurology, Christian-Albrechts-University Kiel, Arnold-Heller-Str. 3, 24105 Kiel, Germany;3. Danish Research Centre for Magnetic Resonance, Centre for Functional and Diagnostic Imaging and Research, Copenhagen University Hospital Hvidovre, Kettegaard Allé 30, 2650 Hvidovre, Copenhagen, Denmark;4. Department of Neurology, Copenhagen University Hospital Bispebjerg, Bispebjerg Bakke 23, 2400 København NV, Denmark |
| |
| Abstract: | In 25 healthy volunteers the supraorbital nerve was stimulated and evoked potentials were recorded. Leads were placed on the scalp and along the ipsilateral eyebrow-mastoid line and were either referred to a non-cephalic reference (on the neck, or Cv7) or linked to form bipolar derivations. As template wave form was chosen the one obtained from derivation Cz-Cv7, which had an initial triphasic component with negative (SW1a), positive (SW1b), negative (SW1c) polarity (mean latencies 0.63, 0.95 and 1.43 msec), followed by 2 negative waves (SW2 and SW3, mean latencies of 2.20 and 2.89 msec). A final positive wave could be observed in most cases (SP4, mean latency of 4.08 msec). The records collected from the various derivations showed that each component (SW1, SW2, SW3 and SP4) had a different behaviour, thus suggesting separate origins. SW1 would originate from a volley travelling from the point of stimulation towards the mastoid, probably across the ophthalmic branch of the trigeminal nerve. The subsequent components would be generated by deeply situated structures: double pulse stimulation suggests that SW1, SW2 and SW3 are generated before the first synapse, whereas SP4 is a postsynaptic event. A strong similarity exists between the components evoked by stimulation of the supraorbital and the infraorbital nerves. Local anaesthetic block of the frontal nerve on the stimulated side and monitoring of the EMG activity of m. orbicularis oculi and m. frontalis ruled out any muscle contamination of the responses described in this paper. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
