Term: Cerebral cortex, layers1-6a [cortical plate]

Definition: As discussed below (see note 44), certain regions including the claustrum lie deep to the traditional cortex, although they appear to be derived from cortical rather than basal neuroepithelium. For convenience, traditional cortex refers to layers 1-6a, although layer 1 (which contains scattered neurons) is derived embryologically from the preplate, which is quickly divided into layer 1 and the subplate by the cortical plate (see Alvarez-Bolado and Swanson 1996).

Nomenclature: Swanson-1998