Phonation Outline march 4

test 2

Myoelastic aerodynamic description of phonation:

• elastic muscles interact with air

  • self sustaining flow induced oscillation of elastic tissues

  • energy from air flow sustains oscillations

Bernoulli Effect

• pressure is inversely related to velocity

• high pressure=low velocity and vice versa

Glottis needs to be relatively narrow to sustain oscillation. T/F

• T

Vocal folds stop flow of air repeatedly during speech which causes the sound. T/F

T

Is the lateral pressure greater at the opening or closing of the vocal folds?

• greater at the opening of vocal folds

• negative pressure at vocal folds closing

Pressure is positive during convergence of vocal folds and negative at divergent of vocal folds. T/F

• T

Before the vocal folds open, they

• resist the airflow from the lungs, have to wait for pressure to build up to open the vocal folds and glottis

When the vocal folds blow open, they

• air passes through, phonation occurs, then vocal folds begin to close and we see more of the glottis bc it changes its shape to close

When the vocal folds start to close, they

• glottis begins to close, bernoulli effect pulls vocal folds together, closing ripples up (mucosal wave)

vocal folds are under constant adduction. T/F

true