Sensorimotor neurophysiologic mapping consists of two parts: first, contralateral (to the craniotomy side) median somatosensory evoked potentials (SSEPs) phase reversal technique is employed with the attempt to localize the central sulcus (CS). Identification of the latter reveals to the surgeon and neurophysiologist the presumed location of the primary motor cortex. In the second part of the motor mapping, the surgeon stimulates the precentral regions, in order to identify the motor strip. Direct electrical stimulation is applied subdurally or epidurally and triggered muscle motor evoked responses (mMEPs) and/or evoked clinical responses are recorded and/or observed in the contralateral hemibody muscles in anesthetized or awake patients.
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Last date updated on September, 2014