Infected larynx. Endoscope view of the inside of the larynx (voicebox) of a patient with laryngitis (inflamed larynx). The larynx is the lower part of the throat, and forms part of the upper respiratory tract. An inflammation like this is often due to infection, sometimes spreading downwards from the pharynx higher up. The larynx contains the vocal cords (upper centre, white), where air passing out of the lungs resonates to produce vocal sounds. Severe laryngitis can cause the patient to lose their voice. This is subglottic (below the glottis) and acute (sudden onset) laryngitis.
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