Figure 4.

Activation of nonsegmental sacral relay neurons by SCA stimulation through the sacral dorsal columns. Recordings from the left and right L2 ventral roots in one of the experiments during stimulation of the Co2, Co1, S4 and S3 dorsal roots respectively, before (Control), and after a bilateral lesion that interrupted the VF, VLF/LF and DLF at S2/S3 border and left the DF as the only bilaterally intact funiculus. Stimulus trains, S3: 40 pulse 3 Hz, 1.9T (control), 60 pulse 4 Hz, 1.25T (postlesions); S4: 50 pulse 3 Hz, 2T (control), 40 pulse 3 Hz, 1.3T (postlesions); Co1: 40 and 50 pulse (control and postlesions), 3 Hz, 1.25T; Co2: 50 pulse, 4 Hz, 2.5T (control and postlesions).