Control of feeding movements in the freshwater snail Planorbis corneus. I. Rhythmical neurons of buccal ganglia

Experimental Brain Research
Arshavsky YuI Panchin YuV

Abstract

(1) The buccal mass of the freshwater snail Planorbis corneus, dissected together with the buccal ganglia, performs rhythmic feeding movements. Radula movements and the electrical activity in various nerves of buccal ganglia were recorded in such a preparation. The cycle of radula movements consisted of three phases: quiescence (Q), protraction (P) and retraction (R). The activity in the radular nerve was observed mainly in the P-phase and that in the dorsobuccal nerve, largely in the R-phase. (2) Isolated buccal ganglia were capable of generating a feeding rhythm, the activity in buccal nerves being similar to that observed in the buccal mass-buccal ganglion preparation, i.e., a burst in the radular nerve preceded a burst in the dorsobuccal nerve. The activity of neurons in isolated buccal ganglia during generation of the feeding rhythm has been studied with intracellular microelectrodes. About 10% of ganglion neurons exhibited periodic activity related to the feeding rhythm ("rhythmic" neurons). (3) Rhythmic neurons have been divided into 7 groups according to the phase of their activity and to the characteristics of slow oscillations of the membrane potential during the feeding cycle. Group 1 neurons revealed a gradual incre...Continue Reading

References

Jan 1, 1978·Journal of Neurophysiology·J L CohenI Kupfermann
Dec 1, 1985·Journal of Neurophysiology·C J Elliott, P R Benjamin
Sep 1, 1984·Journal of Neurophysiology·M Peters, U Altrup

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Citations

Jan 1, 1996·Somatosensory & Motor Research·M KogoS H Chandler
May 29, 1992·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·C J Elliott, G Kemenes

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