Region II of hippocampus proper
Encyclopedia
Region II of hippocampus proper is a portion of the hippocampal formation
Hippocampal formation
The hippocampal formation is a compound structure in the medial temporal lobe of the brain. There is currently no consensus concerning which brain regions are encompassed by the term, with some authors defining it as the dentate gyrus, the hippocampus proper and the subiculum; and others including...

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Region CA2 is a small region located between CA3 and CA1. Anatomically, in the rat, it is best defined as the strip of cells that receive perforant path input from EC layer II but do not receive mossy fiber connections from DG. Its pyramidal cells are more similar to those in CA3 than those in CA1, so it is grouped as a separate region. Due to its small size, it is often ignored in discussions of the hippocampus, but its high resistance to epileptic damage makes it notable.
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