The term postcentral insular sulcus refers to the sulcus identified by dissection that separates the anterior long gyrus of the insula from the posterior long gyrus in the human. It is well defined in only 44% of hemispheres, Interrupted in 18% and shallow or absent in the remainder ( Ture-1999 ). It is not found in macaques ( Mufson-1997 ) or rodents ( NeuroNames ).