going back in developmental time, now looking for source of trisynaptic circuit (as it had the CA3: the allocortex, particularly : Archicortex is a type of cortical tissue that consists of four laminae (layers of neuronal cell bodies).The main areas of archicortex are the hippocampus and dentate gyrus. Periallocortex is a transitional form between neocortex and either paleo- or archi-cortex. It thus can be either peripaleocortex (anterior insular cortex) or periarchicortex (entorhinal cortex, presubicular cortex, retrosplenial, supracallosal, and subgenual areas).

going back in developmental time, now looking for source of trisynaptic circuit (as it had the CA3: the allocortex, particularly :

Archicortex is a type of cortical tissue that consists of four laminae (layers of neuronal cell bodies).The main areas of archicortex are the hippocampus and dentate gyrus.

Periallocortex is a transitional form between neocortex and either paleo- or archi-cortex. It thus can be either peripaleocortex (anterior insular cortex) or periarchicortex (entorhinal cortex, presubicular cortex, retrosplenial, supracallosal, and subgenual areas).

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