By his examination of the glottis he had the satisfaction of proving that all his theories with regard to the emission of the voice were absolutely correct.
"Resonance in Singing and Speaking"
Thomas Fillebrown
The muscles that control inspiration are powerful; do not, therefore, make the mistake of seeking to control expiration by contraction of the glottis.
"Resonance in Singing and Speaking"
Thomas Fillebrown
For instance, if it is necessary that the glottis be contracted to a point which we will call "half-open" for the production of a certain sound, the brain must first send a message to that organ before the necessary movement can take place.
"Stammering, Its Cause and Cure"
Benjamin Nathaniel Bogue