Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
10 Cards in this Set
- Front
- Back
|
Neurochronaxic Theory
|
Developed in 1950 by Raoul Husson
Each vibratory chicle is initiated by nerve impulse to voclais muscle via RLN of the Vagus nerve (CN X). Frequency of voice depending upon rate of impulses delivered. INVALID: RLN on left longer than right but vocal folds vibrate synchronously. If air was not needed, patients with tracheotimes would be able to phonate, but they can't unless there is air. |
|
|
Puff Theory
|
puffs of air are emitted through the glottis.
puffs of air are set up by vibratory of the glottis this is too simplistic. |
|
|
Myloelastic Aerodynamic
|
1843 by Johannes Muller
Updated by Ingo Titze (PhD) Aero - air pressure and flow Dynamic - movement and change Myo - muscular involvement Elastic - able to return to original state. |
|
|
Myoelastic Aerodynamic Step One
|
Diaphragm Contracts (Lowers)
Chest Cage Expands Air drawn into lungs Vocal Folds are Open |
|
|
Myloelastic Aerodynamic Step Two
|
* Vocal Folds are Closed
Note that complete obstruction not necessary to initiate phonation. A space of 3mm & phonation of 5 cm H20 airflow will cause vibration. * Vocal folds set to proper length and tension for desired frequency by contraction of five laryngeal adductor muscles. |
|
|
Myloelastic Aerodynamic Step Three
|
Air is forced out of the lungs (at the same time the vocal folds are closing).
|
|
|
Myloelastic Aerodynamic Step Four
|
Air slows/stops at underside of the vocal folds.
|
|
|
Myloelastic Aerodynamic Step Five
|
Subglottic air pressure overcomes strength at which vocal folds are held together.
Vocal folds are blown apart. Puff of air emitted through constriction. Airflow rate increases again due to the Bernoulli effect. |
|
|
Myloelastic Aerodynamic Step Six
|
Subglottal pressure reduced when the first puff of air is emitted.
Elasticity and muscular conditions of vocal folds and Bernoulli effect cause repeated vibration cycles. |
|
|
Bernoulli Effect
|
Occurs when velocity of subglottal pressure increases while approaching and passing through constricted glottis.
Increased velocity creates negative pressure between and just below the medial edge of the vocal folds. Vocal folds drawn together due to negative pressure. |
