The aim of this study is to explore the effects of the angle of epiglottis (Aepi) on phonation and resonance in excised canine larynges.
The anatomic Aepi was measured for 14 excised canine larynges as a control. Then, the Aepis were manually adjusted to 60° and 90° in each larynx. Aerodynamic and acoustic parameters, including mean flow rate, sound pressure level, jitter, shimmer, fundamental frequency (F0), and formants (F1′–F4′), were measured with a subglottal pressure of 1.5 kPa. Simple linear regression analysis between acoustic and aerodynamic parameters and the Aepi of the control was performed, and an analysis of variance comparing the acoustic and aerodynamic parameters of the three treatments was carried out.
The results of the study are as follows: (1) the larynges with larger anatomic Aepi had significantly lower jitter, shimmer, formant 1, and formant 2; (2) phonation threshold flow was significantly different for the three treatments; and (3) mean flow rate and sound pressure level were significantly different between the 60° and the 90° treatments of the 14 larynges.
The Aepi was proposed for the first time in this study. The Aepi plays an important role in phonation and resonance of excised canine larynges.
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- Laryngeal Evaluation: Indirect Laryngoscopy to High-Speed Digital Imaging.Thieme, New York2010: 18-20
- Articulatory interpretation of the “singing formant”.J Acoust Soc Am. 1974; 55: 838-844
- Acoustic interpretation of resonant voice.J Voice. 2001; 15: 519-528
- The contribution of aryepiglottic constriction to ‘ringing’ voice quality—a videolaryngoscopic study with acoustic analysis.J Voice. 1989; 3: 342-350
- Clinical Voice Pathology: Theory and Management.5th ed. Plural Publishing, Inc, San Diego, CA2014: 13
- Aerodynamic and acoustic effects of false vocal folds and epiglottis in excised larynx models.Ann Otol Rhinol Laryngol. 2007; 116: 135-144
- On the acoustic effects of the supraglottic structures in excised larynges.J Acoust Soc Am. 2013; 133
- Phonatory effects of supraglottic structures in excised canine larynges.J Voice. 2009; 23: 51-61
- The minimum glottal airflow to initiate vocal fold oscillation.J Acoust Soc Am. 2007; 121: 2873-2881
- Phonatory characteristics of the excised human larynx in comparison to other species.J Voice. 2013; 27: 441-447
- Establishment and analysis of false vocal folds hypertrophy model in excised canine larynges.J Voice. 2017; 32: 143-148
- Onset and offset phonation threshold flow in excised canine larynges.Laryngoscope. 2008; 118: 1313-1317
- Phonation threshold flow measurements in normal and pathological phonation.Laryngoscope. 2009; 119: 811-815
- Speech and Voice Science.2nd ed. Plural Publishing, Inc., San Diego, CA2013: 182-225
- Effect of hydration treatments on laryngeal nodules and polyps and related voice measures.J Voice. 1994; 8: 30-47
Published online: June 28, 2018
Accepted: February 9, 2018
Conflict of interest: The authors have no funding, financial relationships, or conflicts of interest to disclose.
© 2018 The Voice Foundation. Published by Elsevier Inc. All rights reserved.