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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.
Examples of mucous membranes includes: lips, mouth, nasal passages, middle ear and the eustachian tube. Other mucous membranes include the lining of the digestive tract, the lining of the urogenital tract (including the urethra and vagina), the lining of the respiratory tract, and your eyes (conjunctival membranes). 1  Mucous membranes are rich with mucous glands that secrete mucus to help keep the membranes moist. The human body has 4 types of tissue with which our organs, bones, cartilage, and other parts of the body are made. One of the types, epithelium, is subdivided into two categories: mucous membranes, and serous membranes.