hippocampus

It is important for converting short term memory to more permanent memory, and for recalling spatial relationships in the world about us.

The hippocampus consists of the complex interfolded layers of the dentate gyrus (1) and cornu ammonis (2). Their three layered cortex is continuous below with the subiculum (3) which has four, five then six layers as it merges with the parahippocampal gyrus (4).

http://biology.about.com/gi/dynamic/offsite.htm?site=http://anatomy.uams.edu/anatomyhtml/atlas%5Fhtml/n1a7p4.html