Periallocortex
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Periallocortex, also called mesocortex, is one of three subtypes of allocortex, the other two subtypes being paleocortex and archicortex. The periallocortex is formed at transition areas where any of the other two subtypes of allocortex borders with the neocortex (also called isocortex).
Thus, the periallocortex is also subdivided to two subtypes: peripaleocortex (formed at borders between paleocortex and neocortex; one such area is anterior insular cortex), and periarchicortex (formed at borders between archicortex and neocortex; areas considered to belong to periarchicortex include entorhinal cortex, presubicular cortex, retrosplenial cortex, supracallosal cortex and subgenual cortex).