前庭神経二次経路の家兎における実験的組織学的研究
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概要
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The present study was morphologically performed for the purpose to investigate the relationship between the vestibular nuclei and autonomic nervous system.Fifty normal rabbits, weighing about 3kg., each were used for the experiment. In the vestibular nucleus, electrically coagulated lesion was made with the electrode (diameter ca. 0.3mm) inserted along the inferior edge of the occipital bone. The lesion was made as small as possible.Following operation, the rabbits were allowedto live for two weeks and killed by intraventricular perfusion of M*llers solution at the end of this period. Serial frontal sections (20μ) were prepared and stained with Marchis method.1) From the lesion of each vestibular nucleus very fine degenerated fibers proceed into the gray substance of the floor of the IVth ventricule homolaterally and ran ascendingly or decendingly in the dorsal longitudinal fasciculus.The ascending fibers disappear in the gray substance at the level of the pons. The descending fibers terminate in the rostral part of the cervical cord. On the way some descending fibers ramify into the nucleus prepositus hypoglossi and intercalatus.2) Fine degenerated fibers via the bilateral medial longitudinal fasciculus from each vestibular nucleus penetrate the trochlear and oclomotor nuclei, and disappear in the central gray substance.These fibers connect the vestibular nuclei with the dorsal longitudinal fasciculus.3) As above mentioned, these finding suggests that the vestibular nuclei have a close relationship with the sympathetic centrum because the dorsal logitudinal fasciculus is a main pathway from or to sympathetic zone in the hypothalamus.4) Some degenerated fibers, originating in the lesions of the medial and lateral vestibular nuclei, ascend along the dorsal part of the tegmentum in the medulla oblongata bilaterally and go up in the ventrolateral portion of the midbrain in the neighbourhood of the central gray substance. Gradually decreasing in number, they reach to the pretectal region in caudal portion of the diencephalon and disappear in it.
- 社団法人 日本耳鼻咽喉科学会の論文