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Examine the interior of the larynx, which is also covered by mucous membrane. Identify an upper fold, the vestibular fold or false vocal cord and a lower fold, the vocal fold or true vocal cord (Figure 32.1 , Figure 32.2 , Figure 32.3). The space between the two folds is the ventricle or sinus of the larynx. Place a probe in the ventricle and determine the depth of the cavity. Mucus, produced by glands within the mucosal lining of the ventricles, lubricates the surface of the vocal folds.Bring the two halves of the larynx together and observe that the vocal folds are more closely apposed than the vestibular folds. When the vocal folds are approximated and air is exhaled from the lungs, the true vocal folds vibrate and thus produce sound.
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