It is to the vestibular ligaments ( vestibular folds once covered with mucous membrane ) what the rima glottidis is to the vocal ligaments ( vocal folds once covered with mucous membrane )-the space formed when the folds are separated.
2.
But, owing to the connection of the deeper portion with the vocal fold, this part, if acting separately, is supposed to modify its elasticity and tension, while the lateral portion rotates the arytenoid cartilage inward, and thus narrows the rima glottidis by bringing the two vocal folds together.
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