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1 the mucous membrane of the vocal folds are vibrating. 2  NOTE: the structure still moves depending on what configuration we want, but the mucous membranes is what is creating the vibrations.  Anterior Portion: Starts at the anterior commissure and goes posteriorly 1/3 of the vocal cords.
It is formed by nine cartilages (see cartilages of the larynx): These cartilages are connected to each other by muscles and ligaments and lined with mucous membrane. Movement of the cartilages alters the tension of the vocal folds, which changes the pitch of the sound emitted by the vocal folds when they vibrate. The larynx is the upper, expanded portion of the trachea which is specially modified for the production of the voice.