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Journal of Experimental Biology 138,133-153 (1988)
Published by Company of Biologists 1988

Phylogenetic Plasticity of Crustacean Stomatogastric Circuits : II. Extrinsic Inputs to the Pyloric Circuit of the Shrimp Palaemon Serratus

PIERRE MEYRAND ¹ and MAURICE MOULINS ¹

¹ Laboratoire de Neurobiologie et Physiologie Comparées, Université de Bordeaux I and CNRS Place Peyneau, F-33120 Arcachon, France

The rhythmic motor patterns produced by the pyloric circuit of the shrimp Palaemon are substantially different from those of large decapods, although the homologous neuronal circuits are very similar (Meyrand & Moulins, 1988). The extrinsic inputs received by the Palaemon pyloric circuit were similar, at least qualitatively, to the extrinsic inputs known to impinge upon the pyloric circuit of large decapods. These include: rhythmic inputs that descend from another oscillator (the commissural pyloric oscillator, CPO) which appears to impose its own rhythm on neurones of the pyloric circuit; and inputs that have long-lasting effects and control the expression of endogenous burst-generating properties of individual neurones within the circuit via modulatory mechanisms.

The AB–PD neurones were not observed to oscillate, and so do not appear to act as pacemakers for the pyloric circuit as they do in large decapods, probably because of differences in the organization of the modulatory extrinsic inputs.

It is our conclusion that differences in the control of expression of intrinsic properties of neurones of homologous (and structurally similar) circuits belonging to related species can explain how such circuits produce widely different patterned motor outputs.

Key words: neuronal oscillators, modulatory control, crustacean stomatogastric system

Accepted on March 30, 1988

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