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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.
either of two pairs of mucomembranous folds in the larynx. The upper pair (false vocal cords) are not concerned with vocal production; the lower pair (true vocal cords or vocal folds) can be made to vibrate and produce sound when air from the lungs is forced over them See also glottis related adjective glottal.