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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.
Vocal cord nodules and polyps. Vocal cord reactive nodules, also called polyps, are masses of tissue that grow on the vocal cords, typically on the anterior and middle two thirds of the vocal fold. The nodules usually appear as symmetrical swellings on both sides of the vocal cords and develop most commonly in heavy smokers or individuals who use strenuous or abusive voice practices.