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 Bichatīased on its cellular composition, the cornu ammonis is divided into four parts, the so-called Sommer’s sectors CA1 to CA4. A small hippocampal cyst (Hs) reflects the location of the largely obliterated hippocampal sulcus. 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). At the level of the hippocampal tail, the fimbriae continue posteriorly as the crux of the fornix (11) that slants upwards towards the splenium of the corpus callosum (9) and the hippocampal tail continues as the subsplenial gyri (10).Īnatomy of the hippocampal formation at the level of the hippocampal body on 3-T coronal T2. The hippocampal head is separated from the amygdala (5) by the uncal recess of the lateral ventricle (7) and is characterized by small digitations separated by small sulci, the digitationes hippocampi (6). The hippocampal head is the only portion of the hippocampus not covered by the choroid plexus (7). The head (1) is located in front of the mesencephalon, the body (2) can be found at the level of the mesencephalon and the tail (3) is posterior to the mesencephalon. To easily recognize the different portions of the hippocampus, we can use the mesencephalon (4). 1 = hippocampal head, 2 = hippocampal body, 3 = hippocampal tail, 4 = mesencephalon, 5 = amygdala, 6 = hippocampal digitations, 7 = temporal horn of the lateral ventricle, 8 = uncal recess of the lateral ventricle, 9 = splenium of the corpus callosum, 10 = subsplenial gyri, 11 = crura of the fornices. The hippocampal body is shown in detail in Fig. Zoomed-in 3-T coronal T2-weighted images at the level of the hippocampal head ( c) and the hippocampal tail ( d). Anatomy of the hippocampal formation on 3-T axial T2 ( a) and sagittal 3D-MPRAGE images ( b).
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