part of part of in taxon surrounds surrounds Mammalia sulcus gyrus brain sulcus of brain A depression or fissure in the surface of the brain. It surrounds the gyri, creating the characteristic appearance of the brain in humans and other large mammals. fissure of brain HBA:9352 cerebral sulci SCTID:279337001 neuronames:1208 sulcus Wikipedia:Sulcus_(neuroanatomy) DHBA:10610 NCIT:C32292 UBERON:0013118 cerebral sulcus