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On the acoustic effects of the supraglottic structures in excised larynges
Journal article   Open access   Peer reviewed

On the acoustic effects of the supraglottic structures in excised larynges

Fariborz Alipour and Eileen Finnegan
The Journal of the Acoustical Society of America, Vol.133(5), pp.2984-2992
05/2013
DOI: 10.1121/1.4796109
PMCID: PMC3663863
PMID: 23654402
url
https://doi.org/10.1121/1.4796109View
Published (Version of record) Open Access

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.
 Vibration Vocalization, Animal Acoustics Laryngeal Muscles - physiology Phonation Laryngectomy Pressure Electrodiagnosis Biomechanical Phenomena Animals Muscle Contraction Sound Spectrography Larynx - anatomy & histology Dogs Larynx - surgery Kymography Larynx - physiology

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