Physiology Of Phonation Flashcards
Bernoulli principle
As the velocity of a moving liquid or gas increases, pressure within the substance decreases
As a liquid or gas moves through a narrow channel, it increases in velocity
Air passing through a narrow channel like the space between the vf will increase in velocity and decrease in pressure
Myoelastic-aerodynamic theory of phonation
Voice production results from:
Muscle activity
Tissue elasticity
Air pressure/airflow
Elasticity
Property that restores a body to its point of rest after displacement
Rate of vf vibration depends on :
Mass and tension of vocal folds
Body of vocal folds
Thyroarytenoid muscle and vocal ligament
Stiff and dense
Cover of vocal folds
Superficial lamina propria and epithelium
Light and pliable
3 phases of vibratory cycle
Opening phase
Closing phase
Closed phase
Frequency of a sound
Rate at which the wave cycle repeats
Simple waveform
Has one frequency
Complex waveform
Made up of two or more different frequencies
Periodic waveform
Repeats itself over time
Aperiodic waveform
Random and non-repeating
Frequency
cycles/second
Pitch
Perceptual correlate of frequency; measured in Hertz
As pitch increases:
Larynx rises in the neck
Length of vf increase
Tension of vf increases in vocal ligament
Mass of vf decreases (get thinner)
Air flow increases because it takes less subglottal pressure to blow thinner folds apart
