XXXIX The Respiratory Muscle of the Larynx

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Abstract
A method was devised to study directly the mechanical properties and function of the posterior cricoarytenoid muscle in the dog larynx. The abductor muscle of the vocal folds was found to have a longer contraction time than other striated muscles of the body and to be the slowest of the intrinsic laryngeal muscles. The posterior cricoarytenoid was primarily a respiratory muscle, rhythmically contracting at inspiration and relaxing at expiration. Results were discussed in relation to normal function and laryngeal paralysis. Some forms of abductor muscle paralysis attributed to damage of the recurrent laryngeal nerve may be the result of ischemia.

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