Abstract
This chapter discusses the egg laying behavior of Lymnaea, which is initiated by the discharge of the neurosecretory caudodorsal cells (CDCs). These cells are electronically coupled and have their somata in the cerebral ganglia. The egg laying behavior of Lymnaea is observed under five different conditions: (1) spontaneous egg laying of unoperated animals, (2) induced egg laying after clean water stimulus, (3) spontaneous egg laying of animals where the CDCs are monitored using fine wire electrodes, (4) egg laying elicited by electrical stimulation of the CDCs through fine wire electrodes, and (5) induced egg laying following the injection of purified and synthetic CDCH. The neuroendocrine system controlling egg laying behavior in Lymnaea is similar to systems controlling the reproductive behavior of a wide range of animals. Egg laying behavior involves both the neuroendocrine system and a number of motor routines borrowed from other behaviors, including locomotion, feeding, and shell twisting. These routines are clearly modified during egg laying behavior, and this raises the question of how these motor routines are reorganized depending on the behavior in which they occur.
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