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Related Experiment Videos

Velopharyngeal closure and the longus capitis muscle

Y Yamawaki1, Y Nishimura, Y Suzuki

  • 1Department of Platic and Reconstructive Surgery, Faculty of Medicine, Kyoto University, Japan.

Acta Oto-Laryngologica
|September 1, 1996
PubMed
Summary

The longus capitis muscle actively assists in velopharyngeal closure, a crucial function for speech. This finding expands our understanding of the muscles involved in velopharyngeal valving, particularly in individuals with cleft palate.

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Area of Science:

  • Anatomy
  • Physiology
  • Speech Science

Background:

  • Velopharyngeal function is critical for normal speech and is often impaired in conditions like cleft palate.
  • The exact muscular mechanisms of velopharyngeal closure, especially during phonation, remain a subject of research and debate.

Purpose of the Study:

  • To investigate the dynamic mechanism of velopharyngeal function during phonation.
  • To identify all muscles contributing to velopharyngeal closure, particularly in patients with velopharyngeal insufficiency.

Main Methods:

  • Dynamic magnetic resonance imaging (MRI) was utilized to visualize the velopharyngeal area in the transverse plane.
  • Imaging was performed in parallel with the levator veli palatini muscle sling to observe muscle action during speech.

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Main Results:

  • A circular closure pattern was observed in some cases.
  • The longus capitis muscle, an anterior vertebral muscle, was found to be directly involved in velopharyngeal valving.
  • Muscle contraction of the longus capitis contributed to velopharyngeal closure through forward movement of the pharyngeal wall.

Conclusions:

  • The longus capitis muscle is identified as a novel contributor to velopharyngeal closure, alongside the levator veli palatini.
  • This discovery enhances the understanding of the complex muscular dynamics governing speech production and velopharyngeal function.