Evaluating the structural properties of suprahyoid muscles and their potential for moving the hyoid

William Gordon Pearson, Susan E. Langmore, Ann C. Zumwalt

Research output: Contribution to journalArticle

59 Citations (Scopus)

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 cm 2) >MH (-0.02 ± 0.21 cm 2), DG (-0.05 ± 0.11 cm 2), SH (0.14 ± 0.04 cm 2), with negative values representing the anterior direction (p < 0.01); and MH (0.91 ± 0.28 cm 2) >DG (0.29 ± 0.14 cm 2), SH (0.22 ± 0.08 cm 2), GH (12 ± 0.08 cm 2), 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.

Original language English (US) 345-351 7 Dysphagia 26 4 https://doi.org/10.1007/s00455-010-9315-z Published - Dec 1 2011

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Muscles
Deglutition
Deglutition Disorders
Formaldehyde
Analysis of Variance
Neck
Cross-Sectional Studies
Direction compound

Keywords

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

ASJC Scopus subject areas

• Otorhinolaryngology
• Gastroenterology
• Speech and Hearing

Cite this

Evaluating the structural properties of suprahyoid muscles and their potential for moving the hyoid. / Pearson, William Gordon; Langmore, Susan E.; Zumwalt, Ann C.

In: Dysphagia, Vol. 26, No. 4, 01.12.2011, p. 345-351.

Research output: Contribution to journalArticle

Pearson, William Gordon ; Langmore, Susan E. ; Zumwalt, Ann C. / Evaluating the structural properties of suprahyoid muscles and their potential for moving the hyoid. In: Dysphagia. 2011 ; Vol. 26, No. 4. pp. 345-351.
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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 cm 2) >MH (-0.02 ± 0.21 cm 2), DG (-0.05 ± 0.11 cm 2), SH (0.14 ± 0.04 cm 2), with negative values representing the anterior direction (p < 0.01); and MH (0.91 ± 0.28 cm 2) >DG (0.29 ± 0.14 cm 2), SH (0.22 ± 0.08 cm 2), GH (12 ± 0.08 cm 2), 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.",
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