High Quality Content by WIKIPEDIA articles! Corticogenesis is the process in which the cerebral cortex is created. The cortex is on the outer layer of the brain and is composed of up of 6 layers. The process is observed starting with embryonic days 10 to 11.5 (E10 to E11.5), continuing throughout the gestational period. The 6 layers are formed in the ventricular zone and then migrate to their final locations in the cortical plate with the help of various signalers, to form various cortical zones and plates.