Region I of hippocampus proper
Encyclopedia
Region I of hippocampus proper is a portion of the hippocampal formation
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Region CA1 is the first region in the hippocampal circuit that yields a significant output pathway, which goes to entorhinal cortex layer V. It also sends significant output forward to the subiculum
. Like CA3, it receives input from superficial entorhinal cortex along the perforant pathway (note that some authors only consider the input to DG and CA3 to be the perforant pathway, referring to the input to CA1 as the temporoammonic pathway). Unlike CA3, however, it contains very few recurrent connections. In the rat, CA1 contains approximately 250,000 pyramidal cells.
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 CA1 is the first region in the hippocampal circuit that yields a significant output pathway, which goes to entorhinal cortex layer V. It also sends significant output forward to the subiculum
Subiculum
The subiculum is the most inferior component of the hippocampal formation. It lies between the entorhinal cortex and the CA1 subfield of the hippocampus proper.-Paths:...
. Like CA3, it receives input from superficial entorhinal cortex along the perforant pathway (note that some authors only consider the input to DG and CA3 to be the perforant pathway, referring to the input to CA1 as the temporoammonic pathway). Unlike CA3, however, it contains very few recurrent connections. In the rat, CA1 contains approximately 250,000 pyramidal cells.