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. 2014 Oct:22:060007.
doi: 10.1121/2.0001504. Epub 2021 Nov 17.

THE ROLE OF THE THYROARYTENOID MUSCLE IN REGULATING GLOTTAL AIRFLOW AND GLOTTAL CLOSURE IN AN IN VIVO CANINE LARYNX MODEL

Georg Luegmair  1 , Dinesh K Chhetri  1 , Zhaoyan Zhang  1
Affiliations

THE ROLE OF THE THYROARYTENOID MUSCLE IN REGULATING GLOTTAL AIRFLOW AND GLOTTAL CLOSURE IN AN IN VIVO CANINE LARYNX MODEL

Georg Luegmair et al. Proc Meet Acoust. 2014 Oct.

Abstract

This study investigated the effectiveness of individual laryngeal muscles in regulating the mean glottal flow and glottal closure pattern during phonation in an in vivo canine larynx model. Phonation experiments were performed with parametric stimulation of the thyroarytenoid (TA), lateral cricoarytenoid (LCA), interarytenoid (IA), and the cricothyroid (CT) muscles. For each stimulation level, the subglottal pressure was gradually increased to produce phonation. The subglottal pressure, the volume flow, and the outside acoustic pressure were measured together with high-speed recording of vocal fold vibration from a superior view. The results show that the TA muscle played a dominant role in regulating both the membranous glottal width and the glottal closure pattern during phonation, indicating an important role of the TA muscle in regulating voice quality. The TA muscle activation was also the most effective in regulating the mean glottal flow, and thus an important laryngeal adjustment in airflow conservation, particularly at high subglottal pressures or loud voice production, although increasing TA activation decreased the vocal intensity. This study also presented a complete set of data on muscular control of the glottal width and voice production, which can be used in validation of computational models of vocal fold posturing and voice production.

Keywords: Thyroarytenoid muscle; closed quotient; glottal flow; vocal fold posturing.

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Figures

Figure 1.
Figure 1.
(a) Superior view of the vocal folds with feature points that were used to calculate vocal fold elongation and glottal gap width at different anterior-posterior locations.
Figure 2.
Figure 2.
Prephonatory glottal widths in pixels at four anterior-posterior locations at different stimulation conditions of the TA, CT, and LCA/IA muscles.
Figure 3.
Figure 3.
Elongation of the left (top) and right (bottom) vocal folds at different stimulation conditions of the TA, CT, and LCA/IA muscles.
Figure 4.
Figure 4.
The mean glottal flow rate at different stimulation conditions of the TA, CT, and LCA/IA muscles and subglottal pressures.
Figure 5.
Figure 5.
Mean glottal flow (top) and glottal resistance (bottom) as a function of the subglottal pressure at selected conditions of the TA, CT, and LCA/IA muscle activation.
Figure 6.
Figure 6.
The glottal resistance (GR) at different stimulation conditions of the TA, CT, and LCA/IA muscles and subglottal pressures.
Figure 7.
Figure 7.
The closed quotient of vocal fold vibration at different stimulation conditions of the TA, CT, and LCA/IA muscles and subglottal pressures.
Figure 8.
Figure 8.
SPL at different stimulation conditions of the TA, CT, and LCA/IA muscles and subglottal pressures.
Figure 9.
Figure 9.
SPL (top) and F0 (bottom) as a function of the subglottal pressure at selected conditions of the TA, CT, and LCA/IA muscle activation.
Figure 10.
Figure 10.
F0 of vocal fold vibration at different stimulation conditions of the TA, CT, and LCA/IA muscles and subglottal pressures.
See this image and copyright information in PMC

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