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Feeding-induced changes in temporal patterning of muscle activity in the lobster stomatogastric system

Authors
Journal
Neuroscience Letters
0304-3940
Publisher
Elsevier
Publication Date
Volume
254
Issue
2
Identifiers
DOI: 10.1016/s0304-3940(98)00511-4
Keywords
  • Stomatogastric Nervous System
  • Neural Network
  • Rhythmicity
  • Modulation
  • Feeding Behavior
  • Power Stroke
  • Return Stroke
  • Crustacea
Disciplines
  • Computer Science

Abstract

Abstract In the lobster Homarus gammarus, rhythmic masticatory movements of the foregut gastric mill are generated by a small neural network in the stomatogastric ganglion. We have used EMG recordings from intact animals to analyse gastric network output in relation to cycle period before and after feeding. In pre-prandial conditions, muscles controlling lateral teeth closure and medial tooth protraction (driven by MG and GM motor neurons, respectively) express relatively constant, return stroke-like burst durations, but change to a variable-duration power stroke-like phenotype after feeding. In contrast, the LPG neuron-innervated lateral teeth opener muscle switches from power stroke to return stroke-like behavior. Thus alternate phases within a single motor program may invert their temporal properties according to the behavioral situation.

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