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An on-axis MN sensory mapping by a 2 x 4 grid with a triphasic PR, including a P25 response. The PR is between G1/G2 and G5/G6 localizing the CS (red line). The responses from G1 and G5 are precentral, and G2, G3, G4, G7, and G8 are postcentral.
MN, median nerve; PR, phase reversal; CS, central sulcus
