Abstract
Intracellular potentials were studied in giant central nervous system (CNS) neurons of the pteropod molluskClione limacina which lives in the White Sea. The mean amplitude of the action potential (AP) and the resting potential (RP) of 30 neurons from different ganglia was 56. 9±3. 3 mv (35–94 mv) and 46. 6±1. 3 mv (33–60 mv) respectively. The maximal rate of rise of the AP was 20–50 v/sec. Many APs had well-marked after-hyperpolarization (mean amplitude 9.8±1. 2 mv, duration 134. 7±20. 4 msec). In some neurons spontaneous excitatory and inhibitory postsynaptic potentials (EPSPs and IPSPs) were recorded constantly. Mainly IPSPs were recorded from giant neurons of the cerebral ganglia. The mean amplitude of single IPSPs was 4. 9±0. 6 mv and their duration varied from 100 to 500 msec. The reversal potential was about 60 mv. EPSPs recorded from other CNS neurons were of similar amplitude and duration.
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