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Also known as the voice box, the larynx is composed of cartilage that contains the apparatus for voice production. This includes the vocal cords and the muscles and ligaments that move the cords. Mentioned in: Cough, Croup, Epiglottitis, Laryngectomy, Laryngitis, Leishmaniasis, Tracheotomy.
It is formed by nine cartilages (see cartilages of the larynx): These cartilages are connected to each other by muscles and ligaments and lined with mucous membrane. Movement of the cartilages alters the tension of the vocal folds, which changes the pitch of the sound emitted by the vocal folds when they vibrate. The larynx is the upper, expanded portion of the trachea which is specially modified for the production of the voice.