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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]
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 ...
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]
As this technique relies on periodic vocal fold vibration, it cannot be used in patients with moderate to severe dysphonia. [17] High speed digital imaging of the vocal folds (videokymography), another imaging technique, is not subject to the same limitations as laryngeal stroboscopy. A rigid endoscope is used to take images at a rate of 8000 ...
This will produce the corresponding subharmonic to that frequency. For example, in a 1:2 ratio, each second vibration of the vocal folds, the vestibular fold will complete a single vibration cycle which will result in an subharmonic produced an octave below the bass tone produced by the vocal cords.
Falsetto (/ f ɔː l ˈ s ɛ t oʊ, f ɒ l-/ fawl-SET-oh, fol-, Italian:; Italian diminutive of falso, "false") is the vocal register occupying the frequency range just above the modal voice register and overlapping with it by approximately one octave. It is produced by the vibration of the ligamentous edges of the vocal cords, in