superior cerebellar peduncle
Definition: a large bundle of nerve fibers that originates from the dentate and interpositus nuclei and emerges from the cerebellum in the rostral direction, along the lateral wall of the fourth ventricle. The bundle submerges from the dorsal surface of the brainstem into the mesencephalic tegmentum, where most of its fibers cross in the massive decussation of the superior cerebellar peduncles. Part of the bundle terminates in the contralateral red nucleus; the bulk of the fibers continue rostrally to parts of the ventral intermediate nucleus of thalamus, ventral lateral nucleus of thalamus, and central lateral nucleus of thalamus.
Synonym(s): pedunculus cerebellaris superiorTA, brachium conjunctivum cerebelli
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