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Fortunately for these singers, when the conditions were made known to them, they were in a position, or at least were perfectly willing, to rest, because of the fear that a knowledge of their condition instilled. Indeed, the situation is always one to cause serious alarm. The beautiful symmetry of the arytenoids is impaired and the agility of the voice is destroyed.
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.
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.
It is necessary to exercise great care, or the membranes connecting the cartilages together will be cut through; and on the other hand, unless the work in the neighborhood of the arytenoids be cautiously done, these cartilages may be injured, and it is most important that their swivel-like action and their relations to the true vocal bands be observed.
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.
Ogle records instances of congenital absence of the uvula. Anomalies of the Epiglottis. Morgagni mentions a man without an epiglottis who ate and spoke without difficulty. He thought the arytenoids were so strongly developed that they replaced the functions of the missing organ. Enos of Brooklyn in 1854 reported absence of the epiglottis without interference with deglutition.
The cartilages are the epiglottis, thyroid, cricoid, arytenoid, the two small, unimportant cornicula laryngis, or cartilages of Santorini, surmounting the arytenoids, and the two cuneiform, or cartilages of Wrisberg, in the folds of mucous membrane on each side of the arytenoids. The muscles are attached to the main cartilages.
There are two pairs of small bodies, the cartilages of Santorini, or cornicula laryngis, surmounting the arytenoids, and the cuneiform, or cartilages of Wrisberg, situated in the folds of mucous membrane on each side of the arytenoids; but these structures are of little importance.
This consists of four cartilages, with their connecting ligaments, the thyroid, the cricoid, and the two arytenoids, and of nine so-called intrinsic muscles, two crico-thyroid, right and left, two thyro-arytenoid, two posterior crico-arytenoid, two lateral crico-arytenoid, and one arytenoideus. The inner edges of the thyro-arytenoid muscles form the vocal cords.
Factors in the Production of the Voice. Muscles which pass from the cricoid cartilage to the outer angle of the arytenoids act to bring the vocal cords close together, and parallel to one another, so that the space between them is narrowed to a slit. A strong expiration now drives the air from the lungs through the slit, between the cords, and throws them into vibration.
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