Histological characterization of lip and tentacle nerves in Lymnaea stagnalis

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

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29 Citations (Scopus)


The lip and tentacle nerves of the pond snail, Lymnaea stagnalis, were characterized using histological techniques. Anatomical drawings showed the detailed distributions of the superior lip, median lip, and tentacle nerves in the lip and tentacle; in particular it was found that the mouth is mainly innervated by the superior lip nerve. The tentacle nerve was clarified to form a zigzag structure along the extension direction in a shrinking tentacle. By backfilling of the superior lip nerve and/or the median lip nerve with fluorescent dyes, the neurons in the CNS made some clusters, whereas those stained from the tentacle nerve made other clusters. These stained neurons were not part of the central pattern generator or its regulatory neurons for feeding. The present results, therefore, suggest that the superior lip nerve may be employed as a principal factor in the chemosensory transduction from the mouth, and that no direct inputs occur through the lip and tentacle nerves to the central pattern generator or its regulatory neurons for feeding.

Original languageEnglish
Pages (from-to)127-136
Number of pages10
JournalNeuroscience Research
Issue number2
Publication statusPublished - 1999 Feb 1



  • Buccal ganglion
  • Cerebral ganglion
  • Cerebral giant cell
  • Chemosensory
  • Feeding
  • Median lip nerve
  • Superior lip nerve
  • Tentacle nerve

ASJC Scopus subject areas

  • Neuroscience(all)

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