Abstract
Vocal folds are two infoldings of complex tissue housed in the larynx whose vibration, known as phonation, results in voice. To create voice, vocal folds are adducted, effectively closing the glottis or the space between them creating a pressure difference between the top and bottom of the tissue. This pressure difference, combined with Bernoulli forces and tissue elasticity, pushes the vocal folds apart and brings them back together again [1]. This rapid, sustained opening and closing cycle produces vocal fold vibration at various fundamental frequencies ranging from 0 to 300 Hz for normal vocal levels [2]. The vocal folds are multilayer structures that consist of muscle, lamina propria, and epithelium. Fundamental frequency is controlled by laryngeal muscles which alter vocal fold physical properties, such as length and thickness. The extracellular matrix (ECM) of the lamina propria contributes significantly to vocal quality. Disruption of vocal fold vibration and/or quality through muscular dysfunction, airflow disruption, or tissue damage results in disturbance of normal voice production. Vocal fold scarring, a prevalent vocal fold injury, is characterized by pathophysiologic changes to the lamina propria ECM, directly causing a marked decrease in voice quality [3].
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Miri AK. Mechanical characterization of vocal fold tissue: a review study. J Voice 2014; 28:657–67.
Caton T, Thibeault SL, Klemuk S, Smith ME. In reference to viscoelasticity of hyaluronan and nonhyaluronan based vocal fold injectables: Implications for mucosal versus muscle use—Reply. Laryngoscope 2007, 117(8): 1506–1508.
Chan RW, Titze IR. Dependence of phonation threshold pressure on vocal tract acoustics and vocal fold tissue mechanics. Journal of the Acoustical Society of America 2006; 119:2351–62.
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Gaston, J., Thibeault, S.L. (2016). Chapter 8 Vocal Folds. In: Murphy, W., Black, J., Hastings, G. (eds) Handbook of Biomaterial Properties. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-3305-1_35
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DOI: https://doi.org/10.1007/978-1-4939-3305-1_35
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