Abstract
VARIOUS types of evidence indicate that the end-plate potential of frog twitch muscle fibres is an electrically inexcitable synaptic activity1,2. Electrical inexcitability of the synaptic membrane has been demonstrated most clearly in cells in which electrically excitable activity is lacking, for example, the electro-plaques of marine electric fishes3 and slow muscle fibres of frog4. Electrical inexcitability of synaptic membranes in other cells has also been demonstrated1,2. Hitherto, however, it has not been shown that the chemically excitable5 synaptic membrane of twitch muscle fibres is also unresponsive to electrical stimuli. The junctional region is small, and there is intermingling of membrane of greater and lesser chemical sensitivity5.
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