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. Author manuscript; available in PMC: 2007 Jun 8.
Published in final edited form as: Neuroscientist. 2006 Feb;12(1):67–79. doi: 10.1177/1073858405283392

Fig. 9.

Fig. 9

Examples of inhibitory ipsilateral corticospinal actions mediated by lumbar commissural interneurons. A–C and D–E, Records from two different sartorius motoneurons on the left side (upper traces) and from the cord dorsum (lower traces). A–C illustrate mutual facilitation of synaptic actions following stimulation of the right medial longitudinal fascicle (MLF) and of the ipsilateral (left) pyramidal tract (PT). D–E, Records allowing a comparison of the timing of inhibitory postsynaptic potentials (IPSPs) evoked by MLF and PT stimuli when their effectiveness was increased by 4-aminopyridine (4-AP). The latency of the MLF IPSP in both C and D was compatible with disynaptic coupling and that of the PT IPSP in E was 1.8 ms longer (compatible with one or two additional synaptic delays). All descending fibers on the left side of the spinal cord were transected at mid-thoracic level. Modified from Figure 10 in Edgley and others (2004) and from Figure 3 in Jankowska and others (2005). Reproduced with permission of the Society for Neuroscience (copyright 2004 and 2005).