Abstract
In the identified neurons B1, B2 and B3 of Helix pomatia an intracellular injection of Na + induced an outward current in 10% and an inward current in 90% of the experiments. The outward current was associated with an increase and the inward current with a decrease of the membrane conductance. Both currents reversed at membrane potentials of between −60 and −70 mV. Inward currents were also elicited by intracellular Li + or tris-[hydroxymethyl]-aminomethane (Tris +) injection. All inward currents were reduced by extracellular administration of tetraethylammonium or quinine. It is suggested that the outward current represents a calcium-activated potassium current and that the inward current is due to a blockade of potassium channels from the intracellular side.
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