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Post-tetanic effect on dorsal root reflex and flexor reflex in the forelimb of cats

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An attempt was made to elucidate whether changes in presynaptic events (dorsal root reflex, DRR) are reflected tightly in those of postsynaptic events (flexor reflex, FR) by comparing post tetanic time courses of both reflexes.1.The DRR recorded from a sensory branch of median nerve (MN) or from the superficial radial nerve (SRN) elicited by test stimulation (TS) to the other nerve showed post tetanic depression (PTD) following tetanic conditioning stimulation (CS) to the nerve to which TS was applied. Simultaneously recorded FR in the deep radial nerve showed post tetanic potentiation. Post tetanic effects such as time constants and durations were identical for the DRR and FR at fixed conditioning frequency. Optimal frequency, producing maximum effects, was 300–500 Hz when the MN was conditioned, but 50–100 Hz when the SRN was conditioned.2.Antidromic spike potentials (ASP) and synaptically evoked late potentials (ALP) were elicited by the intramedullary terminal's stimulation. Following CS to either the MN or SRN, the ASPs recorded from the conditioned nerve and the ALPs recorded from the conditioned and unconditioned nerves showed PTD. When the MN was conditioned, the ASP and ALP changed in parallel relation. Optimal frequency of CS was 300–500 Hz. When the SRN was conditioned, the ALP changed in opposite relation with the ASP. Optimal frequency of the ALP was 50–100 Hz although that of the ASP was 300–500 Hz. Such a difference in the optimal frequencies of the ALPs was similar to that of the DRRs. Furthermore, central delay of the ALP was identical to that of the DRR.3.These results indicated that the DRR and FR share the common intraspinal pathway, but the property of the interneurons connected with the MN is different from those with the SRN. For the PTD of DRR, the additional interneurons seem to be necessary. The functional meaning of the difference in the property of those interneurons was

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