Advertisement

Is the Supratrigeminal Area Involved in Jaw-Opening Reflex Activity?

  • P. J. W. Jüch
  • R. F. Minkels
  • F. Klok
  • J. IJkema-Paassen

Abstract

Stimulation of the inferior alveolar nerve (IAN) elicits the so-called jaw-opening reflex (JOR) which is associated with excitation of the jaw-opening muscles and inhibition of the jaw-elevator muscles. High threshold afferents with their cell bodies located in the trigeminal ganglion (tg) are responsible for the activation of the jaw-opening muscles, whereas low threshold afferents with their cell bodies in the mesencephalic trigeminal nucleus (Me5) are involved in the inhibition of the jaw-elevator muscles (Dessem, Iyadurai & Taylor, 1988). The central neuronal routing of the JOR is not fully understood yet. High threshold short latency JOR activity is mediated through a disynaptic pathway involving interneurones in the trigeminal brainstem nuclear complex (TBNC). However, the location of interneurones involved in high-threshold long latency JOR activity is still disputed. This study indicates that the supratrigeminal area (Su5), adjacent to the Me5, contains elements of a neuronal pathway involved in reflex activation of the jaw-opening muscles.

Keywords

Trigeminal Ganglion Reflex Activity Inferior Alveolar Nerve Digastric Muscle High Stimulus Frequency 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Bruce, K. & Grofova, I. (1992) Notes on a light and electron microscopic double-labelling method combining anterograde tracing with Phaseolus vulgaris leucoagglutinin and retrograde tracing with cholera toxin subunit B. J. Neurosci. Meth. 45, 23–33.CrossRefGoogle Scholar
  2. Dessem, D., Iyadurai, O. D. & Taylor, A. (1988) The role of periodontal receptors in the jaw-opening in the cat. J. Physiol. 406, 315–330.PubMedGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1995

Authors and Affiliations

  • P. J. W. Jüch
    • 1
  • R. F. Minkels
    • 1
  • F. Klok
    • 1
  • J. IJkema-Paassen
    • 1
  1. 1.Medical PhysiologyUniversity of GroningenGroningenThe Netherlands

Personalised recommendations