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Related Experiment Videos

The vestibular system modulates masseter muscle activity

E Tolu1, M Pugliatti

  • 1Institute of Human Physiology, University of Sassari, Italy.

Journal of Vestibular Research : Equilibrium & Orientation
|January 1, 1993
PubMed
Summary

Vestibular input influences masseter muscle activity, showing excitatory control. This labyrinthine control is faster and asymmetrical, particularly concerning head position, suggesting complex neural pathways.

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Area of Science:

  • Neuroscience
  • Vestibular System
  • Craniofacial Muscle Physiology

Background:

  • The vestibular system plays a crucial role in balance and spatial orientation.
  • The trigeminal nerve innervates muscles of mastication, including the masseter.
  • The relationship between vestibular input and masticatory muscle activity remains incompletely understood.

Purpose of the Study:

  • To investigate the influence of vestibular input on masseter muscle activity.
  • To elucidate the pathways and characteristics of the vestibulomasseteric reflex.

Main Methods:

  • Recording spontaneous electrical activity and evoked responses in masseter motor units in anesthetized guinea pigs.
  • Activating vestibular afferents naturally or electrically.
  • Studying the effects of unilateral labyrinth lesions on masseteric motor unit firing rates.

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Main Results:

  • Vestibular input exerts excitatory tonic control over masseter muscle activity.
  • Labyrinthine control is faster on contralateral than homolateral masseter muscles.
  • Vestibular macular input demonstrates asymmetrical control on masseteric muscles relative to head displacement.

Conclusions:

  • Vestibular input significantly modulates masseter muscle activity through excitatory pathways.
  • The vestibulomasseteric reflex exhibits contralateral dominance and asymmetry based on spatial orientation.
  • Polysynaptic pathways likely connect the vestibular system to the trigeminal complex, forming the anatomical basis for this reflex.