Region IV of hippocampus proper
Encyclopedia
Region IV 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 CA4 (often called the hilus or hilar region when considered part of the dentate gyrus, as neurons here do not have pyramidal morphology like those of areas CA1 & CA3 (suggested by Lorente de No & verified by David G. Amaral))

Region IV 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...

.

Region CA4 (often called the hilus or hilar region when considered part of the dentate gyrus, as neurons here do not have pyramidal morphology like those of areas CA1 & CA3 (suggested by Lorente de No & verified by David G. Amaral))

Region IV 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...

.

Region CA4 (often called the hilus or hilar region when considered part of the dentate gyrus, as neurons here do not have pyramidal morphology like those of areas CA1 & CA3 (suggested by Lorente de No & verified by David G. Amaral)) contains mossy cells that primarily receive inputs from granule cells located nearby in the dentate gyrus in the form of mossy fibers. They also receive a small number of connections from pyramidal cells located in CA3. They, in turn, project back into the dentate gyrus at distant septotemporal levels.
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