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Figure 3: Exposure and identifying S2 nerve root by lifting the pyriformis muscle. The nerve roots are stimulated with a bipolar probe starting with 5 milliamperes current, and noting down evoked potentials generated on the electromyogram

Figure 3: Exposure and identifying S2 nerve root by lifting the pyriformis muscle. The nerve roots are stimulated with a bipolar probe starting with 5 milliamperes current, and noting down evoked potentials generated on the electromyogram