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![Pre-operative electrodiagnostic studies and intraoperative neurophysiologic monitoring: power and pitfalls](https://image.oaes.cc/768e5a9f-6a1a-463c-99ac-81016b118ac3/5403.fig.1.jpg)
Figure 1. Nerve conduction responses. A: Stimulation of motor axons recording over the muscle with detecting a compound muscle action potential (CMAP). Amplitude reflects the number of muscle fibers contributing to the response; distal latency reflects the time (msec) it takes for a stimulus to pass along a nerve to produce the CMAP. B: Stimulation of a sensory nerve recording a sensory nerve action potential (SNAP). Amplitude reflects the number of nerve axons contributing to the response. Distal latency is equivalent to conduction velocity.