Subglottic Pressure Lab Report
Subglottic pressure:23
The force of the expiratory blast of air, as well as determining the volume of sound, also influences slightly the pitch. Increase in air pressure in associated with increase in pitch, when it is increased in volume. It has been suggested that in the production of very high notes the false cords come into contact with the upper surface of vocal cords and this raise the frequency of their vibrations.
Theories of mechanism of vocal fold vibration The vocal fold vibration is essential to voice production was demonstrated in the first canine vocal fold experiment performed by Ferrein in 1974. Subsequently, there have been a number of hypothesis about how vocal fold vibration is controlled.24
Neurochronaxic
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The elasticity (mainly passive recoiling) of the vocal fold, and
(3). Drop in subglottal pressure. These factors together cause the vocal folds to close toward their approximated position. When the closure of the aperture obstructs airflow, a new rise of subglottal pressure builds up until it is again sufficient to deform the vocal fold tissues, and another cycle of the opening phase starts. This cycle of vibration is called the glottal cycle.
Classification of voice disorders
Currently there is no standardized nomenclature regarding voice disorder and pathological conditions do the vocal folds. A number of classification proposal have been advanced, but these have been limited to specific types of voice disorders such as muscle tension dysphasia. Traditional texts have also tried to classify voice disorders as functional or organic, or as disorders resulting from vocal fold closure or lack of vocal fold closure. These descriptive categories lack reference to pathologic conditions or the presence or absence of a lesion. No such global
Classification system exists at present.25 The proposed classification and nomenclature, divides voice disorder into four major categories.25 1. Nonorganic voice disorder
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