(A, B). (A, B). Median motor nerve conduction study. Active recording electrode is over the APB muscle, with stimulation at the wrist, elbow, axilla,

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Presentation transcript:

(A, B). (A, B). Median motor nerve conduction study. Active recording electrode is over the APB muscle, with stimulation at the wrist, elbow, axilla, and brachial plexus. Panel B shows the motor response from stimulation at all four sites. Responses are of the same shape but the latency is longer with more proximal stimulation. (C) The compound muscle action potential (CMAP) and its parameters. A Mallik, and A I Weir J Neurol Neurosurg Psychiatry 2005;76:ii23-ii31 ©2005 by BMJ Publishing Group Ltd