Agranular cortex
Agranular cortex is a cytoarchitecturally defined term denoting the type of heterotypic cortex that is distinguished by its relative thickness and lack of granule cells. Examples are Brodmann [area 30], the agranular insula, and the precentral gyrus, the site of the primary motor cortex. An area of cortex that is only slightly granulated is termed dysgranular.