For speech, muscle contraction brings the folds together
Folds are blown apart
Folds come back together via 2 things:
Mucosal wave:folds do not open all at once; rather the bottom part opens first then the top part opens. A good mucosal wave is necessary for the folds to open in a uniform and symmetric fashion for optimal voice quality.
Neural Control of Larynx (See Fig)
Vagus Nerve (CN X) has three branches that innervate the larynx.
Recurrent Laryngeal Nerve (RLN)
Superior Laryngeal Nerve (SLN): as 2 branches of its own:
Physiology of the Larynx 1. Changing Frequency of VF vibration heard as “Pitch” Three mechanisms alter the frequency of vocal fold vibration: