We have also determined MR voxel-based morphometry as a method permitting to define and evaluate volumes of different hippocampal subfields. The incidence rate of different hippocampal anatomical variants in healthy population was specified in the study. In our study we have analyzed MRI data of mediobasal parts of temporal lobes in healthy volunteers based on literature review and our own experience. Besides, hippocampal formation, being complex structure, consists of different parts, including subregions (head, body and tail) and subfields (СА1-СА4, subiculum, presubiculum, dentate gyrus), which changes depend on different psychological and psychiatric symptoms. Different anatomical variants of these structures were described in literature indistinctly, often leading to misinterpretation of neuroimaging findings. This can be explained by the insufficient knowledge of normal volume and linear measurements of brain structures responsible for human emotional and cognitive functioning including different age periods. However, obtained results are often contradictory. Nowadays the question of limbic structures involvement in different types of brain pathology is much debated in literature.
The parahippocampal gyrus is involved in memory storage and recall.Аннотация научной статьи по клинической медицине, автор научной работы - Ananyeva Natalia I., Andreev Evgeniy V., Akhmerova Linara R., Salomatina Tatiana A., Wasserman Ludvig I. 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. 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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