Subdivisions of the insula and their connections to other regions. Cytoarchitechturally, a continuous transition between agranular and granular patterns is observed. The anterior insula, in blue, comprises the agranular and anterioventral dysgranular cytoarchitechture, with connections to limbic and sensory regions of the brain. The posterior insula, in red, comprises the granular and dorsoposterior dysgranular cytoarchitechture, with connections to visual, auditory and somatosensory areas. Both areas have connections to the thalamus and within the insula.