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Related Experiment Video

Updated: May 25, 2026

Coordinate Mapping of Hyolaryngeal Mechanics in Swallowing
14:13

Coordinate Mapping of Hyolaryngeal Mechanics in Swallowing

Published on: May 6, 2014

Structural analysis of muscles elevating the hyolaryngeal complex.

William G Pearson1, Susan E Langmore, Louis B Yu

  • 1Department of Anatomy and Neurobiology, Boston University School of Medicine, Boston, MA 02118, USA. bp1@bu.edu

Dysphagia
|January 27, 2012
PubMed
Summary
This summary is machine-generated.

The long pharyngeal muscles, not typically considered in swallowing, show structural potential for hyolaryngeal elevation similar to submental muscles. Suprahyoid muscles possess the greatest potential, challenging current swallowing theories.

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Area of Science:

  • Anatomy
  • Biomechanics
  • Physiology

Background:

  • Hyolaryngeal elevation is crucial for opening the upper esophageal sphincter during swallowing.
  • Current theories attribute this function primarily to submental and thyrohyoid muscles.
  • The role of long pharyngeal muscles in hyolaryngeal elevation is largely uninvestigated.

Purpose of the Study:

  • To investigate the potential contribution of long pharyngeal muscles to hyolaryngeal elevation.
  • To compare the force-generating potential of various muscles involved in hyolaryngeal elevation using a cadaver model.
  • To challenge and potentially amend current swallowing theories regarding muscle function.

Main Methods:

  • Utilized a cadaver model to document muscle structural properties.
  • Modeled muscles as force vectors based on physiological cross-sectional areas (PCSAs) and attachment sites.
  • Employed analysis of variance (ANOVA) to compare the superiorly directed unit force vectors of different muscle groups.

Main Results:

  • Long pharyngeal muscles (0.73 ± 0.20 cm²) showed similar hyolaryngeal elevation potential to submental muscles (0.92 ± 0.24 cm²).
  • Both submental and long pharyngeal muscles demonstrated significantly greater potential than the thyrohyoid muscle (0.49 ± 0.18 cm²).
  • Suprahyoid muscles (1.52 ± 0.35 cm²) exhibited the highest potential for hyolaryngeal elevation.

Conclusions:

  • Structurally, long pharyngeal muscles have a significant, previously uninvestigated potential to contribute to hyolaryngeal elevation.
  • Suprahyoid muscles possess the greatest structural potential for hyolaryngeal elevation.
  • These findings necessitate a re-evaluation of current swallowing theories and may require functional verification.