Abstract
Generally, these anatomical abnormalities were asymmetric. The histological findings in the two limbic regions consisted mainly of poorly developed structure in the upper layers, with a heterotopic displacement of single groups of nerve cells in the entorhinal region. Particularly, the disturbed structure of the second layer Pre-α in medial and central fields of the entorhinal region, situated in the parahippocampal gyrus (group 2 a), suggests a disturbance of neuronal migration in a later phase of cortical development.