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The added pull of the posterior cricoarytenoid muscles during the slight effort at inspiration restores their tone and increases the mobility of all the attached structures.
The _arytenoids_ form the upper posterior boundary of the larynx and our particular interest in them is directed toward their motility, for the rotation of the arytenoids at the cricoarytenoid articulations determines the movements of the cords and the production of voice.
To insert the esophagoscope in the midline, posterior to the arytenoids, requires a degree of force dangerous to exert and almost certain to produce damage to the cricoarytenoid joint or to the pharyngeal wall, or to both.
Usually it should penetrate until a firm resistance is felt; but care must be used not to damage the cricoarytenoid joint.
When some swelling of the laryngeal structures still exists, this gradual corking has a therapeutic effect in lessening the stenosis by exercising the muscles of abduction of the cords and mobilizing the cricoarytenoid articulation during the inspiratory effort.
Care must be exercised not to injure the cricoarytenoid joint.
Corking the cannula is an excellent orthopedic treatment in certain cases where muscle atrophy and partial inflammatory fixation of the cricoarytenoid joints are etiological factors in the stenosis.
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