Intrasomatically recorded action potentials in snail neurons (Helix pomatia): different shapes with different sites of origin in the neuronal arborization. A combined morphological and electrophysiological study.

Fibres of the identified neurons B1 to B3 in the buccal ganglia of Helix pomatia can be divided into three types according to their diameters. Electrical stimulation of nerves containing the different fibres induces typical fast depolarizations in the somata of neurons B1 to B3. The appearance of these depolarizations is strictly correlated to the fibre types. The depolarizations are interpreted as axonal action potentials.