Proprioceptive inputs to large buccal motoneurons controlling pharyngeal expansion in Navanax

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Large electrotonically coupled neurons (G and M cells) on the anterior surface of the buccal ganglion of the opistho branch mollusc, Navanax, are motoneurons causing pharyngeal expansion. Stretch of small muscles causing pharyngeal protraction or electrical stimulation of their nerves elicits unitary EPSP's in G and M cells which can summate to reach threshold. Pharyngeal inflation can decrease coupling between the motoneurons by activation of inhibitory synapses. Small neurons on the dorsal surface of the ganglion form inhibitory synapses on G and M cells, and send axons out the pharyngeal nerve as shown by electrical stimulation of the nerve. Pharyngeal stretch evokes abruptly rising action potentials in these neurons indicating that they are sensory. Feeding in Navanax involves pharyngeal protraction, followed by rapid pharyngeal expansion and then peristalsis with asynchronous expansions and contractions. The excitatory input from protractor muscles may be involved in the transition from the first to second stage. The small inhibitory neurons probably participate in the synaptic uncoupling to permit asynchrony in the contractions of peristalsis.

Original languageEnglish (US)
JournalFederation Proceedings
Volume34
Issue number3
StatePublished - 1975

Fingerprint

Gastrin-Secreting Cells
Cheek
Motor Neurons
Peristalsis
Neurons
Ganglia
Synapses
Electric Stimulation
Pharyngeal Muscles
Mollusca
Excitatory Postsynaptic Potentials
Economic Inflation
Sensory Receptor Cells
Action Potentials
Axons
Muscles

ASJC Scopus subject areas

  • Medicine(all)

Cite this

@article{461c418f216346adbe09a624f079e1ab,
title = "Proprioceptive inputs to large buccal motoneurons controlling pharyngeal expansion in Navanax",
abstract = "Large electrotonically coupled neurons (G and M cells) on the anterior surface of the buccal ganglion of the opistho branch mollusc, Navanax, are motoneurons causing pharyngeal expansion. Stretch of small muscles causing pharyngeal protraction or electrical stimulation of their nerves elicits unitary EPSP's in G and M cells which can summate to reach threshold. Pharyngeal inflation can decrease coupling between the motoneurons by activation of inhibitory synapses. Small neurons on the dorsal surface of the ganglion form inhibitory synapses on G and M cells, and send axons out the pharyngeal nerve as shown by electrical stimulation of the nerve. Pharyngeal stretch evokes abruptly rising action potentials in these neurons indicating that they are sensory. Feeding in Navanax involves pharyngeal protraction, followed by rapid pharyngeal expansion and then peristalsis with asynchronous expansions and contractions. The excitatory input from protractor muscles may be involved in the transition from the first to second stage. The small inhibitory neurons probably participate in the synaptic uncoupling to permit asynchrony in the contractions of peristalsis.",
author = "Spray, {David C.} and Bennett, {Michael V. L.}",
year = "1975",
language = "English (US)",
volume = "34",
journal = "Federation Proceedings",
issn = "0014-9446",
number = "3",

}

TY - JOUR

T1 - Proprioceptive inputs to large buccal motoneurons controlling pharyngeal expansion in Navanax

AU - Spray, David C.

AU - Bennett, Michael V. L.

PY - 1975

Y1 - 1975

N2 - Large electrotonically coupled neurons (G and M cells) on the anterior surface of the buccal ganglion of the opistho branch mollusc, Navanax, are motoneurons causing pharyngeal expansion. Stretch of small muscles causing pharyngeal protraction or electrical stimulation of their nerves elicits unitary EPSP's in G and M cells which can summate to reach threshold. Pharyngeal inflation can decrease coupling between the motoneurons by activation of inhibitory synapses. Small neurons on the dorsal surface of the ganglion form inhibitory synapses on G and M cells, and send axons out the pharyngeal nerve as shown by electrical stimulation of the nerve. Pharyngeal stretch evokes abruptly rising action potentials in these neurons indicating that they are sensory. Feeding in Navanax involves pharyngeal protraction, followed by rapid pharyngeal expansion and then peristalsis with asynchronous expansions and contractions. The excitatory input from protractor muscles may be involved in the transition from the first to second stage. The small inhibitory neurons probably participate in the synaptic uncoupling to permit asynchrony in the contractions of peristalsis.

AB - Large electrotonically coupled neurons (G and M cells) on the anterior surface of the buccal ganglion of the opistho branch mollusc, Navanax, are motoneurons causing pharyngeal expansion. Stretch of small muscles causing pharyngeal protraction or electrical stimulation of their nerves elicits unitary EPSP's in G and M cells which can summate to reach threshold. Pharyngeal inflation can decrease coupling between the motoneurons by activation of inhibitory synapses. Small neurons on the dorsal surface of the ganglion form inhibitory synapses on G and M cells, and send axons out the pharyngeal nerve as shown by electrical stimulation of the nerve. Pharyngeal stretch evokes abruptly rising action potentials in these neurons indicating that they are sensory. Feeding in Navanax involves pharyngeal protraction, followed by rapid pharyngeal expansion and then peristalsis with asynchronous expansions and contractions. The excitatory input from protractor muscles may be involved in the transition from the first to second stage. The small inhibitory neurons probably participate in the synaptic uncoupling to permit asynchrony in the contractions of peristalsis.

UR - http://www.scopus.com/inward/record.url?scp=0016608895&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0016608895&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0016608895

VL - 34

JO - Federation Proceedings

JF - Federation Proceedings

SN - 0014-9446

IS - 3

ER -