Control of feeding movements in the freshwater snail Planorbis corneus. II. Activity of isolated neurons of buccal ganglia

Experimental Brain Research
Arshavsky YuI Panchin YuV

Abstract

Isolated buccal ganglia of Planorbis corneus are capable of generating a feeding rhythm. In the present work, "rhythmic" neurons of different groups (see Arshavsky et al. 1988a) have been extracted, by means of an intracellular microelectrode, from the buccal ganglia. (1) After extraction, efferent neurons of groups 3, 5, 7, 9 and most group 4 neurons generated repeated spikes at a frequency controlled by a polarizing current. Any periodic oscillations, similar to those during feeding rhythm generation, were absent in these isolated neurons. It is concluded, therefore, that these neurons are "followers", that is, their rhythmic activity before extraction is determined by synaptic inputs from other neurons of the ganglia. (2) Isolated interneurons of groups 1 and 2 generated slow periodic oscillations similar to those observed in these neurons before their extraction. Subgroup 1e neurons generated smoothly growing depolarization accompanied by increasing spike activity; this depolarization was periodically interrupted by abrupt hyperpolarization, after which a new cycle started. Subgroup 1d neurons periodically generated short series of spikes. Group 2 neurons periodically generated a rectangular wave of depolarization with spik...Continue Reading

Citations

May 29, 1992·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·C J Elliott, G Kemenes
Oct 5, 2002·Journal of Neurophysiology·Volko A StraubPaul R Benjamin
Sep 24, 2016·The Neuroscientist : a Review Journal Bringing Neurobiology, Neurology and Psychiatry·Yuri I Arshavsky
Mar 4, 2000·Journal of Pharmaceutical and Biomedical Analysis·B B Anderson, A G Ewing
Jan 1, 1995·Journal of Physiology, Paris·D CattaertF Clarac
May 24, 1991·Brain Research·J M Ramirez, K G Pearson

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