Fig. 2

Anatomy of the hippocampal formation at the level of the hippocampal body on 3-T coronal T2. The hippocampal formation consists of the cornu ammonis or hippocampus proper, which can histologically be divided in the four Sommer sectors CA1–CA4, and the dentate gyrus (DG). A small hippocampal cyst (Hs) reflects the location of the largely obliterated hippocampal sulcus. A = alveus, Ac = Ambient cistern, B = basal vein of Rosenthal, C = tail of caudate nucleus, ChF = choroid fissure, CS = collateral suclus, DG = dentate gyrus, P = posterior cerebral artery, PHG = parahippocampal gyrus, Sub = subiculum, T = temporal horn of the lateral ventricle, Tb = transverse fissure of Bichat