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Overview. Problems. Contents. Anatomy. Point: 18. Superior cerebellar peduncle. Function: Principle efferent (out of) pathway of the cerebellum. Plays a major role in the coordination of the IPSI. arm and leg.esion of the superior cerebellar peduncle CAUDAL to the decussation will result in motor incoordination on the IPSI. side of the body, whereas a lesion that occurs ROSTRAL to the decussation results in CONTRA. motor incoordination of the arm and leg. Other Note: REMEMBER THAT CEREBELLAR LESIONS RESULT IN IPSI.
Contents. Anatomy. REMEMBER 1  : The cells of origin of fibers of the superior cerebellar peduncle lie in the deep cerebellar nuclei. 2  These nuclei lie deep in the white matter of the cerebellum, under what is called the cortex of the cerebellum. The superior cerebellar peduncle crosses at caudal midbrain (inferior colliculus) levels, after which most of the fibers ascend to the red nucleus (rostral midbrain) and dorsal thalamus (ventral lateral and ventral anterior nuclei).