The main distinctive feature between perirhinal cortex (PER) and postrhinal cortex (POR) is the distinctive presence of ectopic cells in anterior portions of POR, which are absent in PER. In addition, cells in layer II of POR are somewhat smaller than in PER. Area 35 (PER35) lacks a clear laminar differentiation between layers II and III, whereas the anterior portion of POR does show a difference between the two layers. Finally, in POR an apparent granular layer IV can be distinguished, which is incomplete ventrally (dysgranular) and complete at more dorsal levels (granular). In contrast, PER35 is agranular. Staining for parvalbumin or calbindin does not reveal striking differences between PER and POR.
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