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 language | English |
|---|---|
| Pages (from-to) | 163-167 |
| Number of pages | 5 |
| Journal | Journal of the Autonomic Nervous System |
| Volume | 57 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - Mar 7 1996 |
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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 journal › Article
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TY - JOUR
T1 - A comparative study of changes operated by sympathetic nervous system activation on spindle afferent discharge and on tonic vibration reflex in rabbit jaw muscles
AU - Passatore, Magda
AU - Deriu, Franca
AU - Grassi, Claudio
AU - Roatta, Silvestro
PY - 1996/3/7
Y1 - 1996/3/7
N2 - 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.
AB - 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.
KW - Jaw muscle
KW - Mesencephalic trigeminal nucleus
KW - Neuromuscular spindle
KW - Stretch reflex
KW - Sympathetic nervous system
KW - Tonic vibration reflex
UR - http://www.scopus.com/inward/record.url?scp=0029996155&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0029996155&partnerID=8YFLogxK
U2 - 10.1016/0165-1838(95)00074-7
DO - 10.1016/0165-1838(95)00074-7
M3 - Article
C2 - 8964942
AN - SCOPUS:0029996155
VL - 57
SP - 163
EP - 167
JO - Journal of the Autonomic Nervous System
JF - Journal of the Autonomic Nervous System
SN - 0165-1838
IS - 3
ER -