fig5
![Pre-operative electrodiagnostic studies and intraoperative neurophysiologic monitoring: power and pitfalls](https://image.oaes.cc/768e5a9f-6a1a-463c-99ac-81016b118ac3/5403.fig.5.jpg)
Figure 5. EMG recording demonstrating EMG activity with a superimposed artifact in the masseter, orbicularis oculi, and orbicularis oris muscles during the surgical procedure. Amplitude is 20 µV per division. The sweep speed is 400 msec per division.