Postmortem studies suggest that the entorhinal cortex ( EC ) and the subiculum are the hippocampal subregions most affected by AD , .
The dentate gyrus is relatively preserved in most cases .
Postmortem studies suggest that the entorhinal cortex ( EC ) and the subiculum are the hippocampal subregions most affected by AD , whereas the dentate gyrus is relatively preserved in most cases .