gyrus folia A ridge on the cerebral cortex. It is generally surrounded by one or more sulci . gyri of cerebrum uberon neuraxis gyrus cerebral gyrus UBERON:0000200 FMA:83874 gyrus of neuraxis gyrus of cerebral hemisphere gyrus of cerebrum BTO:0002495 NCIT:C32290 folium of brain UMLS:C0458308 folium gyri morphological feature