glottis
i believe the answer you're looking for is the trachea. correction; It is the Rima glottidis
Our vocal chordes vibrate when we talk. our muscles in our vocal chordes contract and expand to create vibrations, which turn into sound waves, and that turns into frequencies that we can hear, and...
The glottis.
Your vocal chords do not open or close, they are either vibrating or still. When you breathe they are still, not producing any sound.