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Local interneurons in the swimmeret system of the crayfish

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Summary

We describe the structures and physiological properties of thirteen kinds of local interneurons in the swimmeret system of the crayfish,Pacifastacus leniusculus. Eight are unilateral, with processes confined to one side of the midline (Figs. 1, 2); five are bilateral, with processes on both sides of the ganglion (Fig. 6). All have most of their branches in the lateral neuropils. All of the unilateral local interneurons were nonspiking; two of the bilateral interneurons generate action potentials. Three kinds of unilateral interneurons could reset the bursting rhythm or could initiate bursting in quiescent nerve cords. Four others drove tonic firing of motor neurons. Four kinds of bilateral interneurons were premotor, and could affect the period and phase of both pattern generators in their ganglion. One unilateral and one bilateral interneuron were sensory interneurons. At least one bilateral interneuron received input from both pattern generators.

Different premotor local interneurons function either in pattern generation, or in hemisegmental coordination of groups of motor neurons, or in bilateral synchronization of the ganglionic pairs of local pattern-generators for the swimmerets.

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Abbreviations

G1. :

ganglion 1.

LN :

lateral neuropil

MT :

miniscule tract

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Paul, D.H., Mulloney, B. Local interneurons in the swimmeret system of the crayfish. J. Comp. Physiol. 156, 489–502 (1985). https://doi.org/10.1007/BF00613973

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