発声・えん下を司る中枢神経支配　疑核を中心として

DOI 被引用文献2件 参考文献112件

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タイトル別名
  • Central Nervous System Participation in Phonation and Deglutition-Focus on the Nucleus Ambiguus.
  • -Focus on the Nucleus Ambiguus-
  • ―疑核を中心として―

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To assess the participation of the nucleus ambiguus (AMB) in phonation and swallowing, localization of motoneurons, cytoarchitecture, projections to AMB and dendritic arborizations were reviewed on the basis of our studies. Our investigations were consistently performed morphologically using cats. The AMB cell column was divided into three parts cytoarchitectually, and was located between the level of the caudal end of the superior olivary nucleus and the level of the caudal end of the inferior olivary nucleus. The rostral onesixth was loose and contained mostly stylopharyngeal motoneurons. The next twosixths were compact and innervated the pharyngeal constrictor, the cervical esophageal and the cricothyroid muscles. The levator veli palatini motoneurons were situated in the middle of the AMB cell column. The caudal half was loose and involved motoneurons for the recurrent laryngeal nerve. The arrangement of the motoneurons indicated somatotopic and segmental supply. Direct projection to AMB was determlined as follows: from the contralateral AMB, bilaterally the nucleus of solitary tract, ipsilaterally the parabrachial nucleus, and bilaterally the periaqueductal gray. Dendrites for each pharyngolaryngeal motoneuron extended to the related interneurons in a reticular formation to receive suitable information from the central nervous system. These dendritic arborizations are thought to reflect specific properties for laryngeal functions.

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