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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.
A few enter via the superior cerebellar peduncle. Afferent fibers are far more numerous that efferent fibers by a ratio of 40:1 (3). The cortico-ponto-cerebellar pathway, composed of the corticopontine tract and the pontocerebellar tract, is major afferent fibers through the middle cerebellar peduncle.he inferior cerebellar peduncle is mainly supplied by the posterior inferior cerebellar artery (PICA). The middle cerebellar peduncle is supplied by the anterior inferior cerebellar artery (AICA) and partly by the superior cerebellar artery (SCA). The superior cerebellar peduncle is mainly supplied by the SCA.