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The two lips come together at their front ends, but diverge to the rear. The rear ends are attached to the arytenoid cartilages. When the ends are brought together by rotation of these arytenoid cartilages, the medial surfaces touch. At the same time they are stretched by the action of the crico-thyroid muscles, which pull apart the points of support at the ends.
These cartilages are capped with little horn-like projections, and give attachment at their anterior angles to the true vocal cords, and at their posterior angles to the muscles which open and close the glottis, or upper opening of the windpipe. When in their natural position the arytenoid cartilages resemble somewhat the mouth of a pitcher, hence their name. The Vocal Cords.
They spelled from the grammars, hyperbole, synecdoche, and epizeuxis. They spelled from the physiology, chlorophyll, coccyx, arytenoid, and the names of the bones and nerves, and all the hard words inside you. They tried the diseases and spelled jaundice, neurasthenia, and tongue-tied.
The muscles act on these movable cartilages, and nearly all the changes in the vocal bands are brought about through the alterations in position of the arytenoid cartilages, to which they are attached behind. Before describing the muscles of the larynx, the reader is reminded of the order of structures from above downward, in front, which is as follows: The hyoid bone. The thyro-hyoid membrane.
They are situated between the cricoid and arytenoid cartilages, and the direction of action is obliquely from below and forward, upward, and backward, so that the arytenoids are brought forward and also approximated more or less, which involves relaxed tension, at least, possibly also shortening of the vocal bands.
Another has discovered a startling effect which a certain action of the arytenoid cartilages has on registers, and sees a perfect voice as the result. Another has discovered that a particular movement of the thyroid cartilage is the only proper way to tense the vocal cords and when every one learns to do this all bad voices will disappear.
This is apparently accomplished by the rotation of the arytenoid cartilages; but the specific muscular contractions concerned in the rotation of the arytenoids have not been located. It is generally asserted by vocal theorists that the quality of the vocal tone, on any one note, is determined mainly by the influence of the resonance cavities. Dr.
Each arytenoid is movable on the cricoid and is connected with one end of a vocal cord. A. In producing sound, B. During quiet breathing. *The Vocal Cords* are formed by two narrow strips of tissue which, connecting with the thyroid cartilage in front and the arytenoid cartilages behind, lie in folds of the mucous membrane.
The pull of this muscle is from the more fixed point, as in all other cases; hence the force is applied in a direction from below and outward, with the result that the arytenoid cartilage is tilted outward, and with it the vocal band is moved from the middle line. View of the larynx as looked at from above. The illustration shows particularly well both the true and the false vocal bands.
At the base is the 'cricoid cartilage, the support and bond of union of the rest. Above are the 'arytenoid cartilages, resting on the 'chorda vocales' and influencing their action.
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