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Dorsal root reflex from A and C afferent fibers induced by electrical stimulation of the sural nerve in rats

CAO Dongr Yuan, NI U Hair Zhang, TANG Xiangr Dong, Li Qiang

Department of Physiology, Medical School of Xian Jiaotong University , Xian710061

Abstract

The purpose of the study was to investigate whether the small fiberevoked dorsal root reflex(DRR) can be obtained by electrical stimulation of the peripheral nerve in rats.Fifty- one DRRs were recorded from different kinds of fiber filaments in the proximal ends of the cut LS dorsal root following
electrical stimulation of the sural nerve.According to the kind of afferent fibers in the sural nerve associated with the DRRs from dorsal root，these DRRs were divided into five different types:Aa}, fiberevoked Aa; DRR(Aa}- Aa;D R R)， AgD R R， eDRR，Aa eDRR and C eDRR The results obtained show that the DRR can be obtained from either A-fibers(including As fibers) or C fibers of dorsal root filaments by stimulation of the sural nerve.It is therefore suggested that either A}DRR or eDRR can be used as a validity index of presynaptic inhibition of the thin primary afferent terminals for investigation of the modulation mechanisms of peripheral effectors.

Key words: neurobiology;dorsal root reflex;elect rophysiology;primary afferent depolarization;dorsalroot potential;presynaptic inhibition;C fiber

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Citing This Article：

CAO Dongr Yuan, NI U Hair Zhang, TANG Xiangr Dong, Li Qiang. Dorsal root reflex from A and C afferent fibers induced by electrical stimulation of the sural nerve in rats. Acta Physiol Sin 2003; 55 (1): (in Chinese with English abstract).