The distribution of spinal evoked potentials across dorsal surface in conditions of dorsal roots transection
DOI:
https://doi.org/10.15587/2519-8025.2017.93617Keywords:
evoked potentials, amplitude, longitudinal distribution, deafferentation, dorsal root, spinal cordAbstract
The aim of experiments on the cats was determine specificity the distributions evoked potentials (EP) of the spinal cord (SС) across dorsal surface in lumbar segments before and after dorsal roots transection.
We used a standard electrophysiological techniques abduction biopotentials directly from the surface of the brain. To activate neurons SC was used stimulus on the nerves of the ipsilateral hindlimb.
In experiments was found that after transection one of the ipsilateral dorsal root (DR) observe a reduction of the first negative and positive component of EP and the displacement of the point of maximum response to centre of dorsal surface. Simultaneously with this, the second component increases in amplitude (the local process disinhibition of neurons of second component). The additional deafferentation brain near the investigated segment leads to oppression all the components of EP and shifts the point of maximum response on the contralateral side.
We conclude that a violation of the integrity of the dorsal roots after injury can be found depending on the amplitude of components of EP and the value of shift point of the maximum potential from the ipsilateral to contralateral part on the dorsal surface.
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