

The 5 cortical regions are labeled: ag, agranular insula iop, intermediary operculum pI, primary insula pOp, paralimbic operculum pC, parahippocampal cortex pIa, frontal operculum.


(A) Drawing of left hemisphere of a macaque monkey (adapted from an image in the OpenStax anatomy atlas on that shows the appearance of the insula and its cortical regions. 