ザリガニ神経線維の細線維と巨大線維の持続性発射について(<特集>脳と神経の研究II)
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The responses with repetitive firing to stimuli in the fine and giant nerve fibres were observed by means of intracellular microelectrodes. Fine fibres responded with repetitive firing to sustained depolarizing current, and they could also respond repetitively to high frequency stimuli. In giant fibres, on the contrary, repetitive firing could not be evoked by means of constant current since they had a typical property of rapid accommodation to constant current. Even in the responses to trains of short shocks, giant fibres terminated their spike train earlier than fine fibres. The difference in excitability as to repetitive firing between both fibres can not be said to be brought about by membrane resistance. But the fine fibre which responds repetitively to constant current possesses higher membrane resistance than do the another fine fibres. The repetitive firing evoked by constant current is controlled both by the after-effects of firing and by the depressant effect of constant current. In the same way, the after-effects control the repetitive response to trains of short shocks. On the other hand, the repetitive stimuli, by themselves might have a depressant effect on restoration after the spike termination. In any case, it is concluded that a spike train is terminated because of the decrease in membrane resistance. And it may be said that the decrease in membrane resistance results from the K^+-accumulation outside of the membrane during repetitive firing.
- 千葉大学の論文
- 1965-11-28
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