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Summary of neurophysiological findings in neural lesions.
| Distal latency | Conduction velocity | CMAP amplitude | EMG | ||
|---|---|---|---|---|---|
| Myelin | Increased | Decreased | Normal or slightly decreased (except in conduction block) | Normal | |
| Axonal | Axonotmesis | Normal or slightly altered | Normal or slightly altered | Decreased | Denervation and remodeling of the remaining units |
| Neurotmesis | Absent | Absent | Absent | Presence of denervation, no voluntary activation | |
CMAP, Compound Muscle Action Potential; EMG, Electromyography.
