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Dysphagia

, Volume 26, Issue 4, pp 345–351 | Cite as

Evaluating the Structural Properties of Suprahyoid Muscles and their Potential for Moving the Hyoid

  • William G. PearsonJr.
  • Susan E. Langmore
  • Ann C. Zumwalt
Original Paper

Abstract

Superior and anterior hyoid movements are important events in pharyngeal deglutition. This cross-sectional study uses a cadaver model to document the structural properties of the muscles underlying these movements in an effort to understand how their morphology influences function. Measurements to determine physiological cross-sectional areas (PCSAs) of swallowing muscles were taken from hemisected head and neck formalin-fixed cadaver specimens (n = 13). Coordinates of muscle attachment sites and PCSAs were used to calculate \( \hat{i} \) and \( \hat{j} \) unit force vectors, where \( \hat{i} \) and \( \hat{j} \) represent anterior-posterior and superior-inferior directions, respectively. The suprahyoid muscle subsamples were grouped for analysis as follows: digastric (DG), geniohyoid (GH), mylohyoid (MH), and stylohyoid (SH). The ANOVA with Tukey HSD post hoc analysis of unit force vectors showed the following results: GH (−0.44 ± 0.15 cm2) >MH (−0.02 ± 0.21 cm2), DG (−0.05 ± 0.11 cm2), SH (0.14 ± 0.04 cm2), with negative values representing the anterior direction (p < 0.01); and MH (0.91 ± 0.28 cm2) >DG (0.29 ± 0.14 cm2), SH (0.22 ± 0.08 cm2), GH (12 ± 0.08 cm2), with positive values representing the superior direction (p < 0.01). The morphology of the suprahyoid muscles suggests that based on structural properties, the geniohyoid has the most potential to displace the hyoid in the anterior direction and the mylohyoid has the most potential to displace the hyoid in the superior direction. These data in complement with physiological findings may provide greater insight into these movements for those developing novel treatments for dysphagia.

Keywords

Deglutition Suprahyoid muscles Hyoid movement Physiological cross-sectional area Structural properties Deglutition disorders 

Notes

Acknowledgments

The authors acknowledge Rob Bouchie and Lee Iacopucci, who administer the Boston University School of Medicine Anatomical Gifts Program.

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • William G. PearsonJr.
    • 1
  • Susan E. Langmore
    • 2
  • Ann C. Zumwalt
    • 1
  1. 1.Department of Anatomy and NeurobiologyBoston University School of MedicineBostonUSA
  2. 2.Speech and Hearing SciencesBoston UniversityBostonUSA

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