Physiological characterization of lip and tentacle nerves in Lymnaea stagnalis

Hiroshi Nakamura, Satoshi Kojima, Suguru Kobayashi, Iori Ito, Yutaka Fujito, Hideo Suzuki, Etsuro Ito*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)


The lip and tentacle nerves of the pond snail, Lymnaea stagnalis, were characterized using electrophysiological techniques. When the activity of those nerves was induced in lip-tentacle preparations, aversive taste signals were transmitted through all the lip and tentacle nerves, but appetitive signals could be recorded only through the superior lip nerve. In the CNS immersed in high Mg2+-high Ca2+ saline, electrical stimuli applied to any of the nerves failed to induce action potentials in one of the regulatory neurons (cerebral giant cell: CGC) involved in feeding responses, implying that the signals are polysynaptically transmitted to the CGC. Intracellular recordings revealed that the CGCs in semi-intact half-body preparations received both appetitive and aversive taste signals not only through the superior lip nerve but also through the median lip nerve. In addition, an osphradium was ruled out as a candidate for appetitive reception. The present results, together with our preceding data arrived at by the histochemical analyses, indicate that the appetitive taste transduction responsible for generating feeding responses is performed through the superior lip nerve with some contribution of the median lip nerve. The data showing that the CGC can receive various taste signals suggests that it may play a crucial role in feeding behavior as demonstrated in the study of conditioned taste-aversion. Copyright (C) 1999 Elsevier Science Ireland Ltd.

Original languageEnglish
Pages (from-to)291-298
Number of pages8
JournalNeuroscience Research
Issue number4
Publication statusPublished - 1999 Apr
Externally publishedYes


  • Buccal ganglion
  • Cerebral ganglion
  • Cerebral giant cell
  • Chemosensory
  • Feeding
  • Median lip nerve
  • Semi-intact preparation
  • Superior lip nerve
  • Tentacle nerve

ASJC Scopus subject areas

  • Neuroscience(all)


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