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. 2006 Jun 1;575(Pt 2):527–541. doi: 10.1113/jphysiol.2006.112425

Figure 7. Disynaptic and trisynaptic components of EPSPs evoked in commissural interneurones from the MLF and PTs.

Figure 7

A–F, intracellular records from a commissural interneurone (upper traces) and cord dorsum potentials (lower traces); averages of 20 successive records. A and B, monosynaptic and disynaptic components of EPSPs evoked by strong MLF stimuli. Note constant amplitudes of the first components and temporal facilitation of the later components, after the first and the second stimuli. C, 100 μA MLF stimuli only evoked the later disynaptic EPSP. D, 150 μA MLF stimuli evoked the later components as well as smaller early EPSPs. E, two components of EPSPs evoked by PT stimuli. The dotted lines indicate the onset of the mono- and disynaptic EPSPs in B, C and D, and of those classified as evoked di- and trisynaptically in E. F, an antidromic action potential in the interneurone evoked from the GS motor nucleus (stimulus 40 μA).