Tin Whistle Segmental Vibration of the Vocal Cords 

A squeaking or "tin whistle" voice can be evidence of nodules or other vocal cord injury of overuse.
Background: normal vocal cords vibrate along their entire length even at very high pitch. When nodules or polyps stop vibration in the mid-cord, a tiny (usually anterior) segment may continue to vibrate, creating and equally tiny "tin whistle" quality.
This video explains the difference between full-length and segmental vibration of the vocal cords, with excellent audio and video (vocal cord) strobe light illustrations of both kinds of vibration.
See also: • A Halloween Shriek!!!
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