The fasciolarum cinereum (FC), also referred to as gyrus fasciolaris, presents itself as a medially oriented small continuation of the most anterior part of the hippocampal formation. This is most easily appreciated in horizontal sections taken at dorsal levels. Although very little is known about FC and the borders with the remainder of the hippocampal formation are not that easy to discern, in some histological sections it can be distinguished rather easily. The FC can be further subdivided into a portion that contains granular cells similar to those found in the dentate gyrus (DG), which we will refer to as FC-DG. A second part mainly contains pyramidal cells, and this is further subdivided in a large-celled area that has similarities to CA3, referred to as FC-CA3 and a small-celled portion, a look-alike of CA1, named FC-CA1. In some sections these subdivisions are not easy differentiated, in which case we will use FC to indicate the entire complex. To understand the relationship of the FC with the remainder of the hippocampal formation, a through account of the embryological development is needed (see Stephan, 1975 for further details). Developmental data also clarify the relationship with two other presumed hippocampus-related structures in the brain, the induseum griseum and the anterior or dorsal tenia tecta. Neither one of those is included in the current account.
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