Respiratory behavior in the pond snail Lynmaea stagnalis. II : Neural elements of the central pattern generator (CPG)

In the present study we describe an interneuronal network that controls ventilatory behavior in Lymnaea . An identified interneuron, termed the input 3 interneuron (Ip.3.I), was found to be involved in the opening movement of the pneumostome (expiration), whereas another identified interneuron known...

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Bibliographic Details
Published in:Journal of Comparative Physiology A 1991, Vol.169 (5), p.557-568
Main Authors: SYED, N. I, WINLOW, W
Format: Article
Language:English
Subjects:
Biochemistry. Physiology. Immunology
Biological and medical sciences
Freshwater
Fundamental and applied biological sciences. Psychology
Invertebrates
Lymnaea stagnalis
Mollusca
Physiology. Development
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Summary:In the present study we describe an interneuronal network that controls ventilatory behavior in Lymnaea . An identified interneuron, termed the input 3 interneuron (Ip.3.I), was found to be involved in the opening movement of the pneumostome (expiration), whereas another identified interneuron known as visceral dorsal 4 (V.D.4) caused its closure (inspiration). These cells have reciprocal inhibitory connections with each other, which accounts for their opposing effects on common follower motor neurons. In isolated brain preparations a third identified interneuron, right pedal dorsal 1 (R.Pe.D.1) initiated the respiratory cycle by the excitation of Ip.3.I. Whereas Ip.3.I in turn excited R.Pe.D.1, the connections between R.Pe.D.1 and V.D.4 were mutually inhibitory. Both Ip.3.I and V.D.4 were active during spontaneously occurring respiratory behavior as recorded from semi-intact preparations, and selective hyperpolarization of V.D.4 during such spontaneous activity disrupted the respiratory behavior.
ISSN:0340-7594
1432-1351
DOI:10.1007/BF00193546