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motor evoked potentials (mep)
The motor evoked potentials measure the conduction of impulses through the motor portion of the spinal cord.  The cortex of the brain is stimulated electrically, through the scalp, and then nerve action potentials are recorded from motor nerves in the extremities or from mechanical activity in the muscles.  Like somatosensory evoked potentials (ssep's), they may be helpful in protecting the function of the spinal cord when  the neurosurgeon is operating  in or around the cord.

 

 

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