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Cellular properties and modulation of the stomatogastric ganglion neurons of a stomatopod, Squilla oratoria

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Abstract

Cellular properties and modulation of the identified neurons of the posterior cardiac plate-pyloric system in the stomatogastric ganglion of a stomatopod, Squilla oratoria, were studied electrophysiologically. Each class of neurons involved in the cyclic bursting activity was able to trigger an endogenous, slow depolarizing potential (termed a driver potential) which sustained bursting. Endogenous oscillatory properties were demonstrated by the phase reset behavior in response to brief stimuli during ongoing rhythm. The driver potential was produced by membrane voltage-dependent activation and terminated by an active repolarization. Striking enhancement of bursting properties of all the cell types was induced by synaptic activation via extrinsic nerves, seen as increases in amplitude or duration of driver potentials, spiking rate during a burst, and bursting rate. The motor pattern produced under the influence of extrinsic modulatory inputs continued for a long time, relative to that in the absence of activation of modulatory inputs. Voltage-dependent conductance mechanisms underlying postinhibitory rebound and driver potential responses were modified by inputs. It is concluded that endogenous cellular properties, as well as synaptic circuitry and extrinsic inputs, contribute to generation of the rhythmic motor pattern, and that a motor system and its component neurons have been highly conserved during evolution between stomatopods and decapods.

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Abbreviations

AB:

anterior burster neuron

CoG:

commissural ganglion

CPG:

central pattern generator

lvn:

lateral ventricular nerve

OG:

oesophageal ganglion

pcp:

posterior cardiac plate

PCP:

pcp constrictor neuron

PD:

pyloric dilator neuron

PY:

pyloric constrictor neuron

son:

superior oesophageal nerve

STG:

stomatogastric ganglion

stn:

stomatogastric nerve

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Correspondence to K. Tazaki.

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Tazaki, K., Chiba, C. Cellular properties and modulation of the stomatogastric ganglion neurons of a stomatopod, Squilla oratoria . J Comp Physiol A 173, 85–101 (1993). https://doi.org/10.1007/BF00209621

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Key words

  • Stomatogastric ganglion
  • Motoneurons
  • Endogenous properties
  • Modulation
  • Stomatopods