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Stroboscopy allows the visualization of vocal cord movement, which vibrate too quickly for human eye to perceive. [15] When assessing the vocal cords, the most common finding in MTD is a posterior glottic gap. [2] Other findings include increased movement of the vocal folds towards one another, and changes in the angles of the vocal fold ...
Spasmodic dysphonia, also known as laryngeal dystonia, is a disorder in which the muscles that generate a person's voice go into periods of spasm. [1] [2] This results in breaks or interruptions in the voice, often every few sentences, which can make a person difficult to understand. [1]
The human vocal cords are roughly 12 – 24 mm in length, and 3–5 mm thick. [9] Histologically, the human vocal cords are a laminated structure composed of five different layers. The vocalis muscle, main body of the vocal cords, is covered by the mucosa, which consists of the epithelium and the lamina propria. [10]
Vocal fold nodules are thought to be the result of vocal fold tissue trauma caused by excessive mechanical stress. [1] [2] [5] During phonation, the vocal folds undergo many forms of mechanical stress. One example of such stress is the impact stress caused by the collision between the left and right vocal fold surfaces during vibration. [2]
A videostroboscopy is an examination of the vocal folds using flashes of light to slow down the image of the vocal fold movement enough to provide a sharp picture of the phases of the movement cycle (mucosal wave.) [13] This procedure provides information about vocal fold vibrations during speech, vocal intensity and vocal frequency. [11]
Also, the existence of an optimal glottal shape for ease of phonation has been shown, at which the lung pressure required to initiate the vocal cord vibration is minimum. [4] This is modal voice , and is the normal state for vowels and sonorants in all the world's languages.