abnormal cerebellum deep nucleus morphology abnormal cerebellum fastigial nucleus morphology MA:0001009 2010-02-11T10:30:15Z abnormal cerebellum tectal nucleus morphology csmith MP:0009983 MPheno.ontology abnormal medial cerebellar nucleus morphology abnormal cerebellum roof 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