peripaleocortex

Peripaleocortex is one of two subtypes of periallocortex,{{cite web|title=Peripaleocortex|url=http://braininfo.rprc.washington.edu/CentralDirectory.aspx?ID=2337|work=BrainInfo|publisher=University of Washington|accessdate=13 October 2017}}{{cite web|title=Periallocortex|url=http://braininfo.rprc.washington.edu/CentralDirectory.aspx?ID=2315|work=BrainInfo|publisher=University of Washington|accessdate=13 October 2017}} the other being periarchicortex.{{cite web|title=Periarchicortex|url=http://braininfo.rprc.washington.edu/CentralDirectory.aspx?ID=2302|work=BrainInfo|publisher=University of Washington|accessdate=13 October 2017}} Peripaleocortex is formed at borders between isocortex (neocortex) and paleocortex (a subtype of allocortex). It shows slow histological transition from the three-layered structure characteristic of paleocortex to the typical six-layered structure characteristic of isocortex. The main peripaleocortex area is anterior insular cortex.

Peripaleocortex does not histologically transit directly to the true isocortex. Instead, at borders between peripaleocortex and isocortex, there are other transitional areas from the isocortex side, called proisocortex.{{cite web|title=Proisocortex|url=http://braininfo.rprc.washington.edu/CentralDirectory.aspx?ID=2311|work=BrainInfo|publisher=University of Washington|accessdate=13 October 2017}} Thus, at borders between paleocortex and isocortex, there are two transitional areas. One transitional area, which is anatomically located closer to the paleocortex side and histologically, too, more resembling "true" paleocortex, is called peripaleocortex area. Another transitional area, which is anatomically located close to the true isocortex side and histologically more resembling it too, is called proisocortex area.