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Updated: May 24, 2025
The thyro-arytenoids, attached along the whole length of the vocal bands externally, have a very important but not well-understood action in the production of the higher tones, and probably also of the falsetto. The whole larynx is lined with mucous membrane, that covering the true vocal bands being very thin.
Several muscles combine in relaxing and shortening the vocal bands. The peculiar mechanism of the highest tones in a soprano voice of great compass is only to be explained by a combined action of several muscles, and a very delicate and precise use of the internal thyro-arytenoids attached along the whole length of the outer surface of the vocal bands.
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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