Class #12

Question 1

van den Berg’s Myoelastic Aerodynamic Theory

Answer 1

1) Subglottic air pressure
2) Elasticity of the vocal cords
3) Bernoulli Effect

Question 2

6 steps of Phonation According to the van den Berg’s Myoelastic Aerodynamic Theory

Answer 2

1) Airflow production
2) Intrinsic Muscle Action (adduction and tensing)
3) Subglottic air pressure
4) Bernoulli Effect
5) Vocal Cords Re-unite
6) End of Phonation (breathing position)
NOTE: repeat steps 1-5 while phonating

Question 3

Airflow Production

Answer 3

• Expiratory phase of pulmonary ventilation

- Sends air to the larynx

Question 4

Intrinsic Laryngeal Muscle Action

Answer 4

• adduct the vocal cords
  1) Interarytenoids (oblique and transverse)
  2) Lateral cricoarytenoid
• tensors
  1) Cricothyroid
  2) Thyroarytenoid

= VC closure

Question 5

Subglottic air pressure

Answer 5

• the VCs are closed, but there is still more air coming out of the lungs
• so the pressure builds below the glottis (where the VCs meet)
• Eventually the pressure becomes so great that it pushes the VCs open

Question 6

Bernoulli Effect

Answer 6

• states: At a point of constriction as velocity increases, pressure decreases
• think car and semi passes you (rocks the car)
• effect: Air rushes through the vocal cords, creating negative air pressure, and makes the vocal cords come together
• end result: vocal cords begin to move together

Question 7

Vocal Cords re-unite

Answer 7

• Because of the Bernoulli Effect and the elasticity of the vocal cords, the VCs come together

Question 8

End of Phonation (breathing position)

Answer 8

• Adductors and tensors relax
• Abductors contract
• the VCs go into resting position because we are no longer phonating