Abstract:
:The scalp distribution of the response to stimulation of the tibial nerve at the medial malleolus was systematically analysed. The somatosensory evoked potential (SEP) was recorded with electrodes placed in a transversal line over the ipsilateral and contralateral postcentral gyri and in a sagittal line over the longitudinal brain fissure. The SEPs recorded over the ipsilateral hemisphere and along the sagittal line were similar to the F response (the response over the foot primary somatosensory region). Over the contralateral hemisphere the waveform of the responses changed obviously from point F to the point C (contralateral hand primary somatosensory region). The C response started with N37, P40 had a longer latency, N50 was not present and the subsequent waves were also considerably different. Mathematical simulation of the responses recorded from the electrodes between points F and C has shown that they represent an electrical algebraic summation of the activity over points F and C. Although the F and C responses may be 2 potentials arising from the opposite sides of a single dipole generator which is located in the medial fissure, it is more probable that the somatosensory evoked potential on tibial nerve stimulation reflects the activity of 2 separate generators.
journal_name
J Neurol Scijournal_title
Journal of the neurological sciencesauthors
Berić A,Prevec TSdoi
10.1016/0022-510x(83)90038-2subject
Has Abstractpub_date
1983-05-01 00:00:00pages
205-14issue
2eissn
0022-510Xissn
1878-5883pii
0022-510X(83)90038-2journal_volume
59pub_type
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journal_title:Journal of the neurological sciences
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