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Localization of laryngeal motoneurons of cats were identified utilizing the horseradish peroxidase (HRP) technique. The results were partically confirmed by direct faradic stimulation of the nuclei selected muscles with a bipolar glass electrode. All laryngeal motoneurons were found ipsilaterally in the nucleus ambiguus except the cricothyroid (CT) motoneurons. Only CT motoneurons were recognized in the retrofacial and ambiguus nuclei and its cell column was extended from the level which is just rostral to the rostral end of the inferior olivary nucleus to the level where the principal nucleus of the inferior olivary nucleus is best developed. The cell column of the posterior cricoarytenoid (PCA), the thyroarytenoid (TA), the lateral cricoarytenoid (LCA) and the interarytenoid (IA) motoneurons were located between the caudal end of CT motoneurons and the caudal end of the inferior olivary nucleus. Their cell columns were situated more caudal than that of CT in the order of PCA, TA, LCA and IA. In the nucleus ambiguus, CT motoneurons were found in the ventral part, PCA motoneurons in the middle part, TA motoneurons in the dorsal part, LCA and IA motoneurons in the whole part. Laryngeal activities caused by the electrical stimulation (30-50 Hz, 0. 1 msec duration, 0.2 mA) at the following two different locations of the nucleus ambiguus were recorded electromyographically: (1) 4mm lateral from the medial line at the level of the first branch of the hypoglossal nerve and (2) 1.5 mm caudal to the first point. Electrical stimulations of the former location caused electric potentials of CT and the cricopharyngeus muscle and those of the latter produced excitation of PCA and/or TA.
社団法人日本耳鼻咽喉科学会の論文

内喉頭筋支配神経起始核について

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