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View of the Cartilages in front project and form the lages and Ligaments of the "Adam's apple," plainly seen and Larynx. A, hyoid bone; B, thyro-hyoid membrane; C, thyroid cartilage; D, erico-thyroid membrane; E, cricoid cartilage, lateral ligaments seen on each side; F, upper ring of the trachea. The larynx has for a framework two cartilages, the thyroid and the cricoid, one above the other.
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.
It will be remembered that to this part of the vocal mechanism are attached, below, the trachea, and above, the tongue, indirectly through the hyoid bone and the thyro-hyoid membrane, as well as certain muscles which influence the relative position of these various parts, so that to maintain the larynx in the same position, absolutely, must be against Nature's methods.
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