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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.
Phonotrauma: What You Need to Know. 1  Vocal nodules (callouses) are superficial lesions on the lining of the vocal cords and usually occur in the middle of both vocal folds.  A vocal cord polyp (blister), usually on one vocal cord, can be soft or firm and can be clear or red from hemorrhage.