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. 2008 Oct 20;586(Pt 24):5865–5884. doi: 10.1113/jphysiol.2008.163998

Figure 8. Ipsilateral NR neurones enhance ipsilateral actions of pyramidal tract neurones via ipsilaterally and contralaterally descending pathways.

Figure 8

Intracellular records from four motoneurones in 3 cats: Q (A and B), Sart (C), PBST (D), and Pl (E) and records from the cord dorsum in the L6 segment. Upper and middle panels: effects of stimulation of the ipsilateral PT alone and of the ipsilateral NR alone. Lower panels: effects of joint stimulation of the NR and PT (black traces) and the sums of records in upper and middle panels (grey traces). Note differences between them. Dotted lines and values in bottom panels give latencies of the facilitated components from the effective PT stimulus. The records are from preparations with only the contralaterally (A–C) or only the ipsilaterally (D–E) descending pathways left intact, with the corresponding simplified diagrams of the neuronal networks in F and G.