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Respiratory function of the intrinsic laryngeal muscles, especially of the posterior cricoarytenoid and cricothyroid, was neurophysiologically studied in experimental animals; cats and dogs. The neural activity in the nerve trunk or individual filaments to the posterior cricoarytenoid (PCA) and the muscle activity of the cricothyroid (CT) were recorded under various physiological conditions to determine their respiratory function. The nerve to the PCA showed a rhythmic motor discharge which was synchronous with the inspiratory phase of respiration. The diacharge was delivered to the PCA which abducted the vocal cord just before the motor nerve activity in the phrenic began. The PCA did not contract as a unit but as a group of many individual motor unit which differed considerably among one another. Some motor units showed activity throughout the entire period of inspiration, whereas others were only partly active, and others completely inactive during inspiration and came into play only when stimulated by such influences as hypercapnea or hypoventilation. Spontaneous activity of the PCA was closely related to that of the diaphragm, and was influenced in the same way by variations in oxygen and carbon dioxide , and was reflexly inhibited by any stimulation to the larynx or neighboring pharynx . The PCA activity in the tracheotomized dog and the CT activity in bilateral recurrent laryngeal nerve paralysis were also discussed.

3. Respiratory Function of the Intrinsic Laryngeal Muscles