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Transcranial motor evoked potentials (TcMEP) are currently the most effective means of evaluating the pyramidal motor pathways and are used during orthopedic spine and scoliosis surgery, as well as neurosurgery where the motor pathways are at risk.
TcMEP monitoring is performed by stimulating the motor cortex and descending motor axons using transcranial electric stimulation,or a very mild electric current on the scalp. These currents are not painful for the patient, and are used only to stimulate a muscle response, typically in both the hands and legs. The motor potentials can then be record
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