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The effect of electrical stimulation of neck afferent on the forelimb extensor (triceps) and flexor (biceps) monosynaptic reflex (MSR) was investigated in chloralose-anesthetized, decerebrated or spinal cats. In chloralose-anesthetized cats, ipsi-and contralateral stimulations of the C<SUB>2</SUB> dorsal root ganglia produced early facilitation (10-30 msec) followed by late inhibition (50-100 msec) in both triceps and biceps MSRS. In decerebrated cats, however, the same cervical volleys induced the reciprocal effect; facilitation (30-150 msec) in triceps and inhibition (30-70 msec) in biceps MSR. In spinal cats, ipsilateral C<SUB>2</SUB> dorsal root ganglion stimulation produced early excitation only with 10 msec in both triceps and biceps-MSRS, but the effect of contralateral C<SUB>2</SUB> dorsal root ganglion stimulation was smaller and sometimes absent.<BR>Intracellular recordings from triceps and biceps motoneurons were performed to elucidate the synaptic mechanism of the above mentiond effect of the neck.<BR>In choloralose-anesthetized cats, ipsi-and contralateral stimulations of C<SUB>2</SUB> dorsal root ganglia induced EPSPS, IPSPS, and also mixed PSPs in triceps and biceps motoneurons. A similar pattern of PSPs occurred in spinal cats, and temporal summation was clearly observed. In decerebrated cats, sometimes the same cervical volleys produced small EPSPs followed by late, long-lasting depolarization in triceps motoneurons.<BR>The latency distribution of PSPs revealed that the synaptic linkage between the neck afferents and the forelimb motoneurons was apparently polysynaptic. The elementary synaptic circuits for the neck reflex seem to be located in the spinal cord. The brain stem structures, however, are indispensable for the reciprocal effects on forelimb motor activities.
- 一般社団法人 日本めまい平衡医学会の論文
一般社団法人 日本めまい平衡医学会 | 論文
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