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Multiple effects of an identified proprioceptor upon gastric pattern generation in spiny lobsters

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Abstract

  1. 1.

    Using deafferented preparations of the stomatogastric nervous system of spiny lobsters (Panulirus interruptus), we stimulated the central soma of the Anterior Gastric Receptor neuron (AGR) and analyzed sensorimotor integration in the gastric central pattern generator during rhythm production.

  2. 2.

    Driving AGR to spike tonically at lower frequencies (10–20 /s) accelerated the gastric rhythm, while higher frequencies (>30 /s) suppressed it.

  3. 3.

    Shorter spike trains in AGR evoked phase-dependent resetting of the gastric rhythm. Repetitive trains could entrain rhythms to both longer and shorter cycle periods. Some pattern-generating effects are consistent with effects upon the lateral gastric neuron, an influential member of the gastric mill network.

  4. 4.

    AGR affected the burst intensity of many of the gastric neurons in specific, complex ways. Some powerstroke motor neurons were excited because AGR activated excitatory, premotor interneurons (E cells). However, AGR also activated parallel, seemingly inhibitory inputs, whose mechanism remains unclear. Still other effects on motor neurons may be mediated partly by synaptic interactions within the network.

  5. 5.

    AGR adjusts the timing, strength and coordination of bursts in the motor innervation of all three teeth of the gastric mill, and may act to optimize the force of chewing to different consistencies of food.

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Abbreviations

AAN:

anterior arch nerve

AGR:

anterior gastric receptor

ALN:

anterior lateral nerve

AM(n):

anterior median motor neuron (nerve)

ant:

anterior direction

CoG:

commissural ganglion

DG(n/N):

dorsal gastric motor neuron (nerve)

DVN:

dorsalve ntricular nerve

E:

E (excitatory) interneuron

GIs:

unidentified gastric interneurons of the commissural ganglia; gm1–4, gastric mill muscles 1-4

GM(n):

gastric mill motor neuron (nerve); int, integrated version

Int 1:

interneuron 1

ION:

inferior oesophageal nerve

LG(n):

lateral gastric motor neuron (nerve)

LPG(n):

lateral posterior gastric motor neuron (nerve)

MG(n):

medial gastric motor neuron (nerve)

MVN:

median ventricular nerve

oss:

ossicles of gastric mill

SON:

superior oesophageal nerve

STG:

stomatogastric ganglion

STN:

stomatogastric nerve.

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Author notes

  1. Y. V. Panchin & Y. I. Arshavsky

    Present address: Institute of Problems of Information Transmission of the Russian Academy of Sciences, Ermolova St 19, 101447, Moscow, Russia

Authors and Affiliations

  1. Department of Biology, 0357, University of California at San Diego, 9500 Gilman Drive, 92093-0357, La Jolla, CA, USA

    R. C. Elson, Y. V. Panchin, Y. I. Arshavsky & A. I. Selverston

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  1. R. C. Elson
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  2. Y. V. Panchin
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  3. Y. I. Arshavsky
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  4. A. I. Selverston
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Elson, R.C., Panchin, Y.V., Arshavsky, Y.I. et al. Multiple effects of an identified proprioceptor upon gastric pattern generation in spiny lobsters. J Comp Physiol A 174, 317–329 (1994). https://doi.org/10.1007/BF00240214

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