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Updated: June 13, 2025
For whereas they began with the tone as it issued from the singer's lips, the modern physiologist of voice-production begins with the singer's mental audition with the tone as the singer conceives it and to which his vocal tract should automatically set or adjust itself even before the breath of phonation leaves the lungs.
The vowel sound is so intimately linked with the consonant the con-sonant, implying this intimate relation in its very name that it seemed extremely difficult to give it individual recognition. To set off the mere labial beginning of the sound by itself, and to recognize it as an all-essential element of phonation, was the feat at which human intelligence so long balked.
The epiglottis, the false vocal cords, the true vocal cords, and the thyro-arytenoid muscles are attached to the interior anterior surface of the thyroid in this order from above down. The false vocal bands have no direct function in phonation. The whole larynx, so far as phonation is concerned, may be said to exist for the true vocal bands.
But the vocal cords are wedded in phonation, and by their attrition the node is formed. Very often strands of tough mucus appear spanning the chink or slit between the cords when they are drawn up in tone-production. The presence of these bands of mucus is an assured precursor of the node. Often they indicate the existence of a node which is hardly perceptible through the laryngeal mirror.
The muscles of the larynx may be divided into the following: Those that open and those that close the glottis; those which regulate the tension of the vocal bands. The crico-thyroid may be considered the most important muscle of phonation, because it is so much used and so effective.
While the false vocal bands have little or nothing to do with phonation directly, they do serve a good purpose as protectors to the more exalted true vocal bands.
The false vocal bands are made up chiefly of mucous membrane; the true vocal bands abound in elastic tissue. The larynx rises during the production of high tones, and during phonation its vibrations may be felt, as also those of the chest. Practical. Feel in your own person the parts of the larynx, etc., from above down.
With a normal attack the spiritus lenis in contradistinction to the spiritus asper the glottis is in position for phonation at the moment breath passes through it. No unvocalized breath precedes it and no explosion follows it. The vowel-attack is clear, precise and distinct.
In all cases a certain degree of approximation of the vocal bands is absolutely necessary for phonation, and the mechanism is generally similar in males and females till the highest tones, above alluded to, are reached. This is in harmony with the following facts: The crico-thyroids are the muscles most in use in ordinary speech and in singing the lower tones.
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