Hippocampal sulcus

Hippocampal sulcus Fissures (lat. sulcus - groove) are deep linear depressions in the brain. They are large grooves or narrow bands of deep gray matter. The main grooves are: dorsal suture, cingulate groove, hippocampal notch, parahippocampal groove, dorsolumbar groove and others.

Many such grooves are known. All of them, with their outlines, usually coincide with the connections of various kinds of convolutions. Some of them are conditional as such and belong to the number of secondary lysomorphic characteristics or adjacent to them. Obviously, most of the grooves arose not without the participation of long-term repeated movements that acted on the brain in an unevenly differentiated manner, but it is unlikely that their appearance was always completely determined by these reasons. A number of scientists present a kind of “biological materialism” regarding the causes of the formation of furrows (N.I. Leporskaya, 1949; V.N. Nasedkin, 1860). They even claim that “morphological and geometric forms of the brain do not exist,” since all its reliefs are determined by the course of nervous processes, which are reflected on the base of the skull from different sides in the form of non-repeating changes. According to L. Ya. Panferov (1957), the groove is a form of neuronal activity, characterized by their special predisposition to the category of “dominant elements with counter-stimulations arising around them in the manner of “capturing” foci of excitation, forming, as it were, false dominants.” On the other hand, if we accept this “hypothetical equation”, then it remains completely unknown what determines the obligatory presence of “particularly predisposed” cells preceding this activation? At its core, this process is a completely different concept, namely, the excitability of nerve formations, regulated only by one moment and nothing more. The predisposition itself is born in some way inevitably earlier, but it has not been reliably clarified how exactly.