内喉頭筋運動の中枢性支配に関する解剖学的研究

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概要

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• The present study was made to investigate the course and termination of the projection fibers from the laryngeal motor cortex to the brain stem in the cat.With square wave electrical stimulation applied to the surface of the cortex, the cortical area which gave evoked muscle actvity in the vocalis muscle was detected and destructed with a suction tip. The laryngeal motor area thus obtained was located in the anterior sigmoid gyrus. Following the destruction, the animal was kept alive for seven days and then sacrificed by vital fixation method. The whole brain was fixed with 10% formalin for over three months and serial frozen sections were made. The specimens were stained using the Nauta- Gygax method for observation. The followings are the summary of the results and considerations.1. It was noted that there was no direct connection of the projection fibers to the nucleus ambiguns which innervates the intrinsic laryngeal muscles. Therefore, intercalated neurons were considered to be connected to the nucleus ambiguus. Their exact locality was discussed.2. Bilateral projection pattern to the brain stem was proved anatomically, though amount of degenerating axons were revealed to show difference on each level.3. Many degenerating axons were observed in the brain stem reticular formation and their termination showed peculiar pattern.4. A functional interrelationship between the axonal termination in the reticular formation and respiratory center was discussed.

• 社団法人 日本耳鼻咽喉科学会の論文

著者

• 小林 武夫

  東京大学医学部

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