Pleuro-buccal projections in pulmonate molluscs.
Using a nickel lysine axonal filling technique, neurons of the CNS that project to the cerebro-buccal connective in pulmonate snails and slugs were stained. In all species examined, a symmetrical, supposedly homologous pair of small neurons situated in the pleural ganglia have been identified. These neurons possess a unique axonal pathway which traverses the ipsilateral pedal ganglion on its way to the cerebral ganglia. The list of species includes both basomatophoran, fresh-water molluscs (Lymnaea stagnalis, L. auricularia, Planorbarius corneus) and stylommatophoran, terrestrial ones (Fruticicola fruticum, Helix pomatia, H. lucorum, Limax cinerea-niger). It is suggested that the paired pleural cells might be involved in the neuronal mechanism for co-ordination of defensive withdrawal with inhibition of feeding.
Alania
M
M
Institute of Developmental Biology, Russian Academy of Sciences, Moscow, Russia.
D000818:Animals; D002610:Cheek / Q000294:innervation; D017952:Ganglia, Invertebrate / Q000033:anatomy & histology; D008974:Mollusca / Q000033:anatomy & histology*; D009474:Neurons / Q000166:cytology; D010994:Pleura / Q000294:innervation; D012908:Snails / Q000033:anatomy & histology