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Published in Terence R. Anthoney, Neuroanatomy and the Neurologic Exam, 2017
What makes the situation potentially unclear, however, is that a few authors describe the indusium griseum as extending beyond the corpus callosum. For example, Matzke and Foltz (1983) describe it as extending “over the corpus callosum and septal area [= the parolfactory area and subcallosal gyrus, p. 111]” (p. 114). Fortunately, Nauta and Feirtag (1986, p. 227–229 [including Fig. 9on, Brodal (1981, p. 673 [Footnote 21]), and Nolte (1981, p. 294) all describe the indusium griseum precisely enough for us to conclude that they consider it to be limited to the extent of the corpus callosum. Consequently, we can state with assurance that Brodal and Nauta and Feirtag consider the hippocampal rudiment to extend beyond the indusium griseum, and that Nolte does not consider the hippocampal rudiment to extend beyond the corpus callosum.
Sectorization of the hippocampal formation: Cytoarchitectonics, topography, or vulnerability to hypoxia?
Published in Journal of the History of the Neurosciences, 2022
The definition of the hippocampus, broadly speaking, is far from being unequivocal. The so-called area dentata is made up of the hippocampus CA4 sector (see below) and the dentate gyrus (Blackstad, 1956) when the hippocampal complex includes the four hippocampus sectors (CA1-C4) and the dentate gyrus (Miller 1991, 35). As for the hippocampal region, its components are the hippocampal complex, the indusium griseum (on the dorsal surface of the corpus callosum) and the fasciola cinerea1The fasciola cinerea is often lacking (Ludwig and Klingler 1956, 24). (dorsal extension of the dentate gyrus in the subsplenial region) (Swanson 2015, 296–97). Finally, the hippocampus also belongs to a so-called “medial temporal lobe memory system,”2The other components of this system are the entorhinal, perirhinal and parahippocampal cortices. as defined by Californian neuroscientist Larry Squire and Georgian psychiatrist Stuart M. Zola in 1991 (see Squire and Zola 1991).