What theory explains vocal fold vibration?
The vocal folds are able to vibrate so rapidly because they are elastic–they come back together after being blown apart. The theory that explains vocal fold movement is the myoelastic aerodynamic theory of phonation, described in your textbook on page 70.
How do vocal folds vibrate?
Vocal folds vibrate when excited by aerodynamic phenomena; they are not plucked like a guitar string. Air pressure from the lungs controls the open phase. The passing air column creates a trailing “Bernoulli effect,” which controls the close phase.
Which layers of the vocal folds vibrate?
Below this is the superficial layer of the lamina propria, a gel-like layer, which allows the vocal fold to vibrate and produce sound. The vocalis and thyroarytenoid muscles make up the deepest portion.
What is the Neurochronaxic theory?
Neurochronaxic theory This theory states that the frequency of the vocal fold vibration is determined by the chronaxie of the recurrent nerve, and not by breath pressure or muscular tension.
What is lamina propria vocal folds?
Results: The deep layer of the lamina propria is the most densely organized band of collagen fibers penetrating the superficial muscle bundles of the vocal muscle. The mean thickness of this layer is about 36% of the lamina propria and shows a network of strongly birefringent fibers (collagen type I and III).
Why do vocal folds vibrate?
The muscles of the larynx (voice box) can also adjust the tension on the vocal folds, like tension on a rubber band. The change in tension affects the rate at which the epithelium (skin) vibrates. This then changes the pitch of the sound.
What makes the vocal cord vibrate?
Vocal cords are also subject to infections, tumors and trauma. When you are silent, the cords remain open. They create an airway through which you breathe. When you speak, the air you exhale from your lungs is forced through the closed vocal cords. This causes them to vibrate.
What is the function of vocal fold?
The vocal folds are not only involved in the production of sound — they also serve a valuable role in moderating airflow and keeping food and water from entering the lungs. The vocal folds are open during inhalation and exhalation to allow air in and out. They are almost closed during singing, speech,…
What makes our vocal cords vibrate?
Your vocal cords, also called vocal folds, are V-shaped bands of tissue that run down the middle of your voice box. When you talk or sing, air from your lungs rushes up through your vocal cords and makes them vibrate open. If you overuse your voice or use it incorrectly, you can irritate your vocal cords.