Some results from the three-mass model of the larynx

Some dynamic models of the larynx reported in the literature show discrepancies related to their physiological counterparts during phonation. These models have a smooth transitional entry angle of about 50° from the trachea into the glottis and they do not include the false vocal folds. Recent tomograms have shown the entry angle of the glottis to be more abrupt than that adopted for these models, the difference being around 60%. The entry angle of the glottis has a strong influence on the glottal waveform if flow separation is based upon it. Also, the pressure at the glottal exit cannot be regarded as a constant pressure, and the exit recovery coefficient has been shown to be dependent on the geometry of the supraglottal cavities