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Updated: May 3, 2025
Direction of Pull of the Lateral Crico-Arytenoids, which adduct the Vocal Cords. In whispering, the larynx takes scarcely any part in the production of the sounds; the vocal cords remain apart and comparatively slack, and the expiratory blast rushes through without setting them in vibration. In stammering, spasmodic contraction of the diaphragm interrupts the effort of expiration.
By its action the cricoid is pulled up in front and down behind, so that the arytenoids are drawn back, and thus the vocal bands tensed and lengthened. The lateral crico-arytenoids and the thyro-arytenoids have the opposite effect i.e., they relax and shorten the vocal bands; hence when they come into play a new register begins.
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