) on the course of the medullary striae of Piccolomini of the fourth ventricle (long known as striae medullares acusticae) of the human brain, in which emphasis is placed on their cerebellar relations, brings up again their probable continuity with the ventral external (crossed) arcuate fibers and hence the origin and course of the latter. Apparent continuity of the ventral external arcuate fibers with the medullary striae, via fibers in the raphe, has been noted repeatedly, especially since the advent of the Weigert method. Kolliker (1896) illustrated this very clearly and naturally concluded that the medullary striae of the fourth ventricle serve to relate the cerebellum to the arcuate nuclei. The series described by Alphin and Barnes strongly suggest that some of these fibers continue into the cerebellum in the neighborhood of the stalk of the flocculus and that the rest end or begin in the region of the pontobulbar body.Both origin and termination in the cerebellum hare been claimed for these striae. Riley ('43) therefore designates them "striae rerebellares (ventriculi quarti) ." Spiegel and 325
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