The vocal cords are an essential part of phonation (speech).
The vocal cords are contained in the larynx and are tightened folds of the laryngeal mucosa. There are two vocal cords each measuring 1 to 2 centimetres between which is a gap through which air can pass to reach the lungs.
When air is expired, the vocal cords vibrate to produce sounds.
The two vocal cords (vocal fold) are contained in the larynx. © Public domain