A comparative study of changes operated by sympathetic nervous system activation on spindle afferent discharge and on tonic vibration reflex in rabbit jaw muscles

Magda Passatore, Franca Deriu, Claudio Grassi, Silvestro Roatta

Research output: Contribution to journalArticle

Abstract

The effect of sympathetic activation on the spindle afferent response to vibratory stimuli eliciting the tonic vibration reflex in jaw closing muscles was studied in precollicularly decerebrate rabbits. Stimulation of the cervical sympathetic trunk, at frequencies within the physiologic range, consistently induced a decrease in spindle response to muscle vibration, which was often preceded by a transient enhancement. Spindle discharge was usually correlated with the EMG activity in the masseter muscle and the tension reflexly developed by jaw muscles. The changes in spindle response to vibration were superimposed on variations of the basal discharge which exhibited different patterns in the studied units, increases in the firing rate being more frequently observed. These effects were mimicked by close arterial injection of the selective α1-adrenoceptor agonist phenylephrine. Data presented here suggest that sympathetically-induced modifications of the tonic vibration reflex are due to changes exerted on muscle spindle afferent information.

Original languageEnglish
Pages (from-to)163-167
Number of pages5
JournalJournal of the Autonomic Nervous System
Volume57
Issue number3
DOIs
Publication statusPublished - Mar 7 1996

Fingerprint

Sympathetic Nervous System
Vibration
Jaw
Reflex
Rabbits
Muscles
Muscle Spindles
Masseter Muscle
Muscle Tonus
Phenylephrine
Adrenergic Receptors
Injections

Keywords

  • Jaw muscle
  • Mesencephalic trigeminal nucleus
  • Neuromuscular spindle
  • Stretch reflex
  • Sympathetic nervous system
  • Tonic vibration reflex

ASJC Scopus subject areas

  • Physiology
  • Clinical Neurology
  • Neuroscience(all)

Cite this

A comparative study of changes operated by sympathetic nervous system activation on spindle afferent discharge and on tonic vibration reflex in rabbit jaw muscles. / Passatore, Magda; Deriu, Franca; Grassi, Claudio; Roatta, Silvestro.

In: Journal of the Autonomic Nervous System, Vol. 57, No. 3, 07.03.1996, p. 163-167.

Research output: Contribution to journalArticle

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