Abstract
1. Cerebral giant cells (CGCs) in the isolated central nervous system (CNS) of the pond snail Lymnaea stagnalis (L.) exhibit bursting activity when superfused with anaesthetic concentrations of halothane. 2. Calcium-dependent components of the CGC action potential appear more sensitive to halothane than do other ionic mechanisms. 3. Higher concentrations of halothane block the chemical synaptic connection between CGC and buccal motoneurone B1, but have no effect on the strong electrotonic coupling between the CGCs. 4. The mechanisms underlying CGC bursting and synaptic block in the presence of halothane are discussed.
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