The parahippocampal gyrus is involved in memory storage and recall. 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. In this opinion article, we discuss surface-based methods that aim to explicitly. The human hippocampus varies considerably in its internal folding configuration, creating major challenges in interindividual alignment and parcellation into subfields. It is divided into three fields (CA1, CA2, and CA3) that process, send, and receive input from other brain regions. Though it is often termed ‘subcortical,’ the hippocampus is composed of a folded ‘archicortical’ sheet contiguous with the neocortex. 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. The hippocampus is the main structure of the hippocampal formation, which is composed of two gyri (brain folds) and the subiculum.
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