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Somatosensory evoked potentials (SSEP) are used during spinal cord surgery, particularly spinal fusion procedures. SSEPs are performed by simulating a peripheral nerve at the wrist or the ankle and recording the responses from the popliteal fossa, cervical spine/brainstem, and somatosensory cortex. SSEPs give direct feedback from the posterior columns of the spinal cord. Any changes in the responses (a greater than 50 percent decrease in amplitude or a greater than 10 percent increase in latency) may indicate an interruption of the posterior column pathways. Dermatome sensory evoked potentials
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