グリコーゲン消耗法による内喉頭筋の運動神経支配様式の検討

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  • Motor Innervation of the Intrinsic Laryngeal Muscles: A Histochemical Study with the Glycogen Depletion Technique.

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Dual motor innervation by the bilateral recurrent laryngeal nerves has been demonstrated in the human arytenoid muscle as a whole muscle, but whether every individual muscle fiber of the arytenoid muscle receives single or dual motor innervation has not been made clear yet. The authors observed the side of innervation on the every individual muscle fiber of the intrinsic laryngeal muscles with the glycogen depletion technique in the arytenoid muscles of the monkey, the guinea pig and the dog.<BR>After prolonged repetitive suprathreshold stimulation of the unilateral recurrent laryngeal nerve, the intrinsic laryngeal muscle fibers innervated by it are depleted of glycogen and are thereby identifiable in a PAS-stained section as unstained fibers (PAS (-)).<BR>In the monkey and the guinea pig, the shape of arytenoid muscles is of the unpaired type similar to that of man, about one half of the arytenoid muscle fibers was PAS (-), and they were distributed in a random mosaic pattern. Therefore, arytenoid muscles of the monkey and the guinea pig are innervated equally by the bilateral recurrent laryngeal nerves as a whole muscle, but every individual muscle fiber is innervated by a unilateral recurrent laryngeal nerve from either side.<BR>In the dog, the ventricular muscle and the transverse arytenoid muscle, whose shapes are paired type, received ipsilaterally dominant dual innervation, while the smaller interarytenoid muscle, whose shape is unpaired type, received dual innervation similar to the arytenoid muscles of the monkey and the guinea pig.<BR>This study suggests that the glycogen depletion technique is a useful method in neurolaryngology and it can possibly supply new information about the physiological features of the intrinsic laryngeal muscles under various conditions of electrical stimulation; however, it is necessary to take the fundamental problems of this method into consideration.

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