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

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

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

Arshavsky YuI,T G Deliagina,G N Orlovsky, Panchin YuV,

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 spike-like oscillations on its top. These results suggest that feeding rhythm generation in Planorbis is based on the endogenous rhythmic activity of group 1 and 2 neurons. (3) A pulse of hyperpolarizing current injected into an isolated neuron of subgroup 1e stopped the growth of depolarization in the neuron and reinitiated the process. This property as well as the character of the synaptic interactions of the interneurons (group 1 neurons excite those of group 2, while those of group 2 inhibit group 1 neurons; Arshavsky et al. 1988b) determine the alternating activity of groups 1 and 2.

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

Arshavsky YuI,TG Deliagina,GN Orlovsky, Panchin YuV,

For similar animals: invertebrates: mollusca: gastropoda: snails research abstracts see: animals: invertebrates: mollusca: gastropoda: snails research

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

PUBLICATION TYPE: Journal Article

Journal: Experimental brain research. Experimentelle Hirnfo

VOLUME: 70

Page Numbers: 323-31

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ISSN: 0014-4819

DAY: 15

MONTH: 02

YEAR: 1988

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

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LANGUAGE: eng

NlmUniqueID: 43312

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

KEYWORDS: Snails

MESH TERMS: physiology

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Grant and Affiliation Information for Control of feeding movements in the freshwater snail Planorbis corneus. II. Activity of isolated neurons of buccal ganglia.

AFFILIATION: Institute of Problems of Information Transmission, Academy of Sciences of the USSR, Moscow.

Country: GERMANY, WEST

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MEDLINETA: Exp Brain Res

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