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The larynx is the expanded superior end of the respiratory passageways situated between the pharynx above and the trachea below. It is referred to as the voice box because of its function in sound production. Structurally, it consists of a mobile cartilage framework with associated skeletal muscles and a lining of elastic mucous membranes that form the vocal folds. The muscles regulate movements of the cartilages to control the tension within the vocal tissues.