Spasmodic dysphonia

a neurological disorder affecting the voice muscles in the larynx, or voice box. When we speak, air from the lungs is pushed between two elastic structures—called vocal folds or vocal cords—with sufficient pressure to cause them to vibrate, producing voice (see figure). In spasmodic dysphonia, the muscles inside the vocal folds experience sudden involuntary movements—called spasms—which interfere with the ability of the folds to vibrate and produce voice.