Are MLR and MLF EPSPs produced by common last-order segmental interneurons?
An earlier paper from this laboratory showed that disynaptic EPSPs in FDL motoneurons produced by reticulospinal axons in the MLF were enhanced only during the extension phase of fictive stepping (Floeter et al. 1993, their Fig. 11). This is confirmed and documented more extensively in the present paper in Figs. 10, 11, and 12, D–F, regardless of the stepping phase in which the FDL pool was active. In contrast to this consistent behavior of MLF EPSPs, the largest disynaptic MLR EPSPs were found during the early flexion phase in most FDL cells. Extensor phase enhancement of MLR EPSPs occurred in only one of the two examples in which FDL activity was active exclusively during the extension phase (Figs. 9 and 12, A–C). This differential control of the MLF and MLR pathways strongly suggests that the two sets of disynaptic EPSPs in FDL motoneurons are produced by entirely different sets of last-order segmental interneurons, as indicated on the proposed circuit diagram in Fig. 13. An analogo
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