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. 2013 May;133(5):2984-92.
doi: 10.1121/1.4796109.

On the acoustic effects of the supraglottic structures in excised larynges

Fariborz Alipour  1 , Eileen Finnegan
Affiliations

On the acoustic effects of the supraglottic structures in excised larynges

Fariborz Alipour et al. J Acoust Soc Am. 2013 May.

Abstract

The acoustic effects of the supraglottic laryngeal structures (SGSs), including the false vocal folds (FVFs) laryngeal ventricle, and the epiglottis were investigated in an excised canine larynx model with and without these anatomical structures. The purpose of this study was to better understand the acoustic contributions of these structures to phonation. Canine larynges were prepared and mounted over a 3/4 in. tube, which supplied pressurized, heated, and humidified air. Glottal adduction was accomplished by rotating the arytenoids with a suture passed behind the vocal folds to simulate the lateral cricoarytenoid muscle action. The SGSs were kept intact in the first part of the experiment and were removed in the second part. Results indicated that when the FVFs vibrated, a low frequency component was observed in the spectral data. The excised larynx with a SGS had a limited range of frequency with subglottal pressure, while the larynx without a SGS had a larger frequency range. The excised canine larynx with a SGS oscillated with a higher phonation threshold pressure and significantly louder.

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Figures

Figure 1
Figure 1
(Color online) (a) Mounted excised larynx with SGSs (epiglottis and FVFs) and control sutures, and (b) mounted larynx without SGSs with grids laid on the left vocal fold before the experiment for calibration.
Figure 2
Figure 2
(Color online) Excised larynx experimental setup including mounting and control fixtures, lights, cameras, and recording sensors.
Figure 3
Figure 3
(Color online) Frequency-pressure relations in excised larynx #1. The symbols are: A and B with SGSs at medium and high adductions; C and D without SGSs at medium and high adduction levels.
Figure 4
Figure 4
(Color online) Pressure-flow sweep in excised larynx #4 with the SGS, showing a change in F0 (fundamental frequency) and Pa (pressure amplitude) with a gradual increase in Ps (subglottic pressure) and flow.
Figure 5
Figure 5
(Color online) Glottal waveforms of the excised larynx #4 with SGSs before FVF activity.
Figure 6
Figure 6
(Color online) Glottal waveforms of the excised larynx #4 with SGSs after FVF activity.
Figure 7
Figure 7
(a) Kymographic images of six different canine excised larynges with SGSs at various oscillating conditions. The darker gray in each kymogram represents the TVFs and the lighter gray represents the FVFs. (b) Kymographic images of six excised larynges without SGSs acquired at 1/3 vocal fold length from the posterior. The horizontal axis is time with a range of 0 to 50 ms.
Figure 8
Figure 8
(Color online) Sound pressure level of excised larynx #3 measure at 15 cm. The symbols are: A, B, and C for larynges with SGSs at low, medium, and high adductions; E, F, and G for larynges without SGSs at low, medium, and high adductions.
Figure 9
Figure 9
(Color online) FFT spectrum of excised larynx #3 with SGSs (topgraph) and without SGS (bottom graph).
See this image and copyright information in PMC

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References

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