Abstract
Changes of free calcium concentration at the outer neuronal surface during paroxysmal depolarization shifts elicited by pentylenetetrazol were measured. Investigations were performed on the identified neuron B3 of the buccal ganglion of Helix pomatia. Extracellular calcium concentration was recorded by calcium-selective microelectrodes. The extracellular calcium concentration steeply decreased with the commencement of paroxysmal depolarization and started to reincrease when the paroxysmal depolarization had reached its plateau level. It is concluded that an influx of calcium ions takes place during paroxysmal depolarization shifts.
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