part of part of regional part of brain olfactory trigone http://upload.wikimedia.org/wikipedia/commons/4/4d/Gray732.png Wikipedia:Olfactory_trigone BAMS:olt SCTID:369102007 BIRNLEX:4042 A small triangular area in front of the anterior perforated substance. Its apex, directed forward, occupies the posterior part of the olfactory sulcus, and is brought into view by throwing back the olfactory tract (adapted from Wikipedia). UBERON:0002922 trigonum olfactorium NCIT:C33813 BAMS:OTr neuronames:34 trigonum olfactorium FMA:74883 UMLS:C0228279 OLT olfactory lobe