Vocal folds

The human larynx contains two pairs of folds made of elastic tissue covered
by mucous membrane. One of them, the false vocal folds, narrows the glottis
during swallowing, preventing pieces of food from getting into the trachea.
Below them, there are are the true vocal folds, which, when appropriately
adjusted, can be made to vibrate as air from the lungs passes out between
them (see: phonation). The vibration produces voice, which is the essential
component of voiced consonants as well as vowels. If the vocal folds are
drawn apart, air flows between them causing no vibration, as in the
production of voiceless consonants. The vocal folds are also called vocal cords.

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