HRP法による各咽頭収縮筋ならびに頸部食道筋の運動神経支配核についての研究

概要

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The location of the efferent neurons innervating the pharyngeal constrictors and the cervical esophagus muscles in the brain stem of cats was identified by means of horseradish peroxidase (HRP) used as a tracer of retrograde peroxidase axonal transport. Following HRP injection into the cephalopharyngeal muscle (CeP), the hyopharyngeal muscle (HP), the thyropharyngeal muscle (TP), the cricopharyngeal muscle (CP) and the cervical esophagus muscle (CE), labeled neurons were found ipsilaterally in the retrofacial nucleus and the rostral part of the nucleus ambiguus. The rostral end of the labeled cell column was located more rostrally for CeP and HP than for TP, CP and CE, but no difference was noted within the former two or within the latter three. The level of the caudal end of the labeled cell column became more caudal in the order of CeP, HP, TP and CP. The caudal end was located more rostral for CE than for TP. The motoneurons of CeP and HP were located in the dorsomedial part of the nucleus ambiguus, while those of CE occupied only a small, ventrolateral portion of the nucleus. The size of the motoneurons of CE was smaller and their number was less than that of the pharyngeal constrictor muscles. Motoneurons of TP and CP showed a wider distribution within the nucleus than those of the other three muscles.
社団法人日本耳鼻咽喉科学会の論文