The Egg-Laying Behavior of the Pond Snail: Electrophysiological Aspects
The ovulation hormone of the pond snail Lymnaea stagnalis is produced by the caudo-dorsal cells (CDCs) of the cerebral ganglia . The CDCs secrete their products (see also Geraerts et al., this volume) during a 30 min period of repetitive spiking activity termed the afterdischarge . This discharge can be elicited by a sudden change of environmental conditions  and triggers a stereotyped pattern of overt and covert behaviors that result in the deposition of an egg mass containing ±100 eggs on a suitable substrate .
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