Abstract
1) Some experiments concerning the anode break excitation (ABE) of single nodes of Ranvier were carried out, applying double air gap method to the toad's nerve fibres.2) The threshold of the ABE was found very high, amounting to several hundred mV or even over1.0V, under the polarization time ranging0.4-10 msec. The high threshold was lowered markedly (to1/20-1/30) by application of catelectrotonus (several ten mV) or by depolarization of the neighbouring nodes by KCl. It was raised, conversely, by anelectrotonus.3) The mechanisms of ABE-occurrence were discussed.
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