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The complex Cortex retrosplenialis (Retrosplenial cortex) consists of Periarchicortical (BA26) and Proisocortical (BA29, 30) areas (Braak H 1980 Architectonics of the Human Telencephalic Cortex. Springer, Berlin-Heidelberg-New York; Zilles and Amunts 2012). The TH nomenclature (H4.8.03.122/129) seems to combine these different structures. The Cortex ectosplenialis (Ectosplenial cortex; BA26) has a primitive three-laminar pattern with Molecular, Densocellular and Multiform layers. The Cortex retrosplenialis granularis (Granular retrosplenial cortex; BA29) shows a four-layered structure: Molecular, External and Internal pyramidal and Multiform layers. The Cortex retrosplenialis dysgranularis (Dysgranular retrosplenial cortex; BA 30) shows a further progression of laminar differentiation with an additional (Internal) granular layer.
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