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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.
Mucous membranes are not skin, and skin is not a mucous membrane, they are two separate things and the walls of the vagina just happen to be mucous membranes (just like the inside of the mouth) while the labia minora happen to be made of skin.