The term temporal operculum (OPRtm) refers to the part of the superior temporal gyrus (STG) that overlies the ventral portion of the insula (INS) in the human ( Roberts-1970 ) and the macaque ( Pandya-1973 ). Identified by dissection, it is separated from the INS byThe inferior limiting sulcus (ilms) ( Ture-1999 ).deep in the lateral fissure (ltf). It is not found in the smooth cortex of the rat and mouse ( NeuroNames )..Updated 9 Aug 2024.