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Published in Terence R. Anthoney, Neuroanatomy and the Neurologic Exam, 2017
On gross anatomical grounds, the hippocampus proper, the dentate gyrus, and the subiculum are contiguous and jointly make up the cortical structures buried within the hippocampal sulcus. By location, by larger size, and by relationship to the nearby alveus and fimbria, these structures are easily differentiable from other derivatives of the embryologic hippocampal formation, such as the indusium griseum. The hippocampus proper and the subiculum also have in common that they contribute efferent fibers to the fornix (e.g., C&S, p. 630; Nolt, p. 299). Indeed, Nauta and Feirtag state that “on that ground it [the ‘subiculum’] is a part of the hippocampus”—the “subiculum hippocampi” (1986, p. 275).
Sectorization of the hippocampal formation: Cytoarchitectonics, topography, or vulnerability to hypoxia?
Published in Journal of the History of the Neurosciences, 2022
The vascularization of the hippocampus had been described almost a century ago by Ushimura (1928a, 1928b). In its course along the medial surface of the temporal lobe, the posterior cerebral artery sends hippocampal rami that end by dividing into a long branch (Nilges septal artery: Nilges 1944; Lindenberg sector artery: Lindenberg 1957) and a short branch (Lindenberg dorsal Ammonshorn artery). In brief, the long branch enters the hippocampal sulcus and supplies CA1-CA3 and the dentate gyrus, whereas the short branch enters the fimbriodentate sulcus and supplies C2-CA4 and the dentate gyrus. A moderate compression of this region (e.g., by cerebral edema or hippocampo-parahippocampal herniation) results in the obturation of the only long branches, seemingly explaining the differential vulnerability to hypoxia of the CA sectors (Gastaut and Lammers 1961, 66; Passouant and Pternitis 1967; Scholz 1952).