abnormal cerebellum deep nucleus morphology abnormal cerebellum fastigial nucleus morphology 2010-02-11T10:30:15Z MA:0001009 MP:0009983 MPheno.ontology abnormal cerebellum roof nucleus morphology abnormal cerebellum tectal nucleus morphology abnormal medial cerebellar nucleus morphology any structural anomaly of the most medial of the cerebellar nuclei; it receives its afferent input from Purkinje cells of the flocculonodular lobe and the vermis, and most of its efferent connections travel via the inferior cerebellar peduncle to the vestibular nuclei and to the medullary reticular formation csmith