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. 2001 Dec 15;537(Pt 3):1047–1058. doi: 10.1111/j.1469-7793.2001.01047.x

Figure 7. Epidural volleys evoked by brainstem stimulation and lateral anodal stimulation in one anaesthetised patient undergoing surgery for an intramedullary tumour.

Figure 7

The epidural electrode is located at the D2 level. Each trace is the mean of ten sweeps. Lateral anodal stimulation evoked a single negative wave (L1) with a latency of 3.6 ms. The volley evoked by brainstem stimulation appeared 1.7 ms earlier.