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Vestibulocerebellar Input in the Frog: Anatomy

Elsevier Science & Technology
DOI: 10.1016/s0079-6123(08)63911-4
  • Earth Science


Publisher Summary The central projection of the VIII nerve in amphibians is described by Ariens Kappers, Huber, and Crosby as consisting of two roots that arise from separate anterior and posterior ganglia on the VIII nerve. In the frog, the posterior root enters the medulla dorsally and the anterior root ventrally, after which they divide to ascend rostrally and descend caudally in the medulla. The dorsal portion is believed to go primarily to the nucleus dorsomagnocellularis while the ventral fiber bundles enter the ventral nucleus of the VIII nerve, which has been suggested to be homologous to Deiters' nucleus. The projection of the primary fibers in the VIII nerve has been studied in the frog with the Fink and Heimer technique. It was found that the primary fibers project to three main regions of the brain: (1) the auditory-vestibular complex; (2) the deep cerebellar nuclei; and (3) the cerebellum. The cyto- and myeloarchitectonics of the auditory-vestibular complex and the deep cerebellar nuclei shows distinct cell groupings within these projection sites.

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