In nerve cells, the concurrent monitoring of multipoint on the axon has been conducted based on the voltage‐clamp method using two long parallel electrodes inside and outside the axon. As the respective membrane potentials have been evaluated by considering the clamping potential, the local current, and the conductance, the membrane potentials were not actually evaluated. We directly measured the actual membrane potentials and local currents of the respective cells using a nerve‐model‐system comprising some liquid‐membrane cells. It is proved that the action potential propagation is artificially facilitated or prevented by both the external electric generator and two long electrodes.
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