![]() ![]() The subiculum connects with the parahippocampal gyrus, a region of the cerebral cortex that surrounds the hippocampus. Ammon's horn is continuous with the subiculum, which acts as the main output source of the hippocampal formation. It is divided into three fields (CA1, CA2, and CA3) that process, send, and receive input from other brain regions. ![]() Ammon's horn is another name for the hippocampus major or hippocampus proper. Neurogenesis (new neuron formation) in the adult brain occurs in the dentate gyrus, which receives input from other brain areas and aids in new memory formation, learning, and spacial memory. The dentate gyrus is folded and nestled within the hippocampal sulcus (brain indentation). The two gyri, the dentate gyrus and Ammon's horn (cornu ammonis), form interlocking connections with one another. Anatomic section.The hippocampus is the main structure of the hippocampal formation, which is composed of two gyri (brain folds) and the subiculum. The axial views show six sections progressing from upper to lower levels.Īxial section of the hippocampus. Temporal horn of the lateral ventricle 14įIG. Hippocampal head (digitationes hippocampi) 9įIG. Gyrus of Andreas Retzius (folds of cornu ammonis) 4 Minjoz Hospital, Besangon (Professor J.F. The Department of Neuroradiology of the J. The latter, on the other hand, includes the amygdala, olfactory bulb, septal nuclei, hypothalamus and the anterior and dorsomedial nuclei of the thalamus. The Department of Neurology of the NYU School of Medicine, New York, NY (Dr R.I. The former comprises of the neocortex, orbital frontal cortex, hippocampus, insular cortex and the cingulate, subcallosal and parahippocampal gyri. The Department of Neuroradiology of the Quinze-Vingts Hospital, Paris (Professors E.A. The illustrations for each section consist of a threedimensional drawing that is then compared with the corresponding anatomical section and MRI. Some sections are parallel to a plane passing through the anterior commissure and the mamillary body (AC–MB plane), which is perpendicular to the hippocampal axis ( Figs 3.25B, 3.27B and 3.29B) and one section is perpendicular to the AC-MB plane and parallel to the hippocampal axis ( Fig. Sagittal section are parallel to the median plane. The bicommissural plane acted as a reference plane for axial sections parallel to this plane and for coronal sections perpendicular to it. Occipital horn of the lateral ventricle 5įree edge of the tentorium cerebelli, which delimits the tentorial opening, encircles the mesencephalon and is in close contact with the two hippocampi 12Ĭoronal, axial and sagittal sections of the hippocampus will be successively presented. 1Įndoventricular view of the hippocampal body 1′Įndoventricular view of the hippocampal head (digitationes hippocampi) 1″ The temporal horns of the lateral ventricles have been opened and the choroid plexuses removed to show the right and left hippocampi. Housing the primary olfactory cortex, it is part of the olfactory system, receiving fibers from the olfactory tract via the lateral olfactory stria. Horizontal section of the lower mesencephalon. The uncus is the most anterior portion of the medial parahippocampal gyrus. The margo denticulatus is composed of rounded protrusions, which form the dentes of the gyrus dentatus, and is separated from the subjacent subiculum by an often ill-defined hippocampal sulcus. The gyrus dentatus is a deep structure whose narrow superficial segment, the margo denticulatus, is partly hidden by the fimbria. Wing of ambient cistern (lateral part of the transverse fissure) Hippocampal head (digitationes hippocampi) 6 Parahippocampal gyrus (entorhinal area) 19Ĭrural cistern and posterior cerebral artery 47įIG. Hippocampal head, uncal part (gyrus dentatus) 3 Hippocampal head, uncal part, (cornu ammonis) 1″ Hippocampal head, digitationes hippocampi (cornu ammonis, cut surface) 2įIG. Parahippocampal gyrus (entorhinal area) 17įIG. Temporal horn of the lateral ventricle 16 1Īnterior apex of the hippocampal head (cornu ammonis) 2 ![]() The coronal views show eight sections moving progressively from anterior to posterior levels.Ĭoronal section of the hippocampal head. ![]()
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