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

Epoxy Halothane Cholera 

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