Anatomical organization of the parahippocampal-hippocampal network
Abstract
The anatomical organization of the parahippocampal-hippocampal network indicates that it consists of different parallel circuits. Considering the topographical distribution of sensory cortical inputs, the hypothesis is that the major parallel circuits carry functionally different information. These functionally different parallel routes reach different portions of the hippocampal network along the longitudinal axis of all fields as well as along the perpendicularly oriented transverse axis of CA1 and the subiculum. In the remaining fields of the hippocampal formation, that is, the dentate gyrus and CA2/CA3, separation along the transverse axis is not present. By contrast, here the functionally different pathways converge onto the same neuronal population. The entorhinal cortex holds a pivotal position among the cortices that make up the parahippocampal region. By way of the networks of the superficial and deep layers, it mediates, respectively, the input and output streams of the hippocampal formation. Moreover, the intrinsic entorhinal network, particularly the interconnections between the deep and superficial layers, may mediate the comparison of hippocampal input and output signals. As such, the entorhinal cortex may form part of a novelty detection network. In addition, the organization of the entorhinal-hippocampal network may facilitate the holding of information. Finally, the terminal organization of the presubicular input to the medial entorhinal cortex indicates that the interactions between the deep and superficial entorhinal layers may be influenced by this input.
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The LEC preferentially receives projections from the perirhinal cortex, insular cortex, PLC and ILC, while the MEC mainly connects with the postrhinal, occipital and parietal cortical regions in rats.
“The LEC preferentially receives projections from the perirhinal cortex, insular cortex, PLC and ILC, while the medial entorhinal cortex (MEC) mainly connects with the postrhinal, occipital and parietal cortical regions in rats (Burwell and Amaral, 1998a, b; Witter et al., 2000).”
From The medial prefrontal cortex - hippocampus circuit that integrates information of object, place and time to construct episodic memory in rodents: Behavioral, anatomical and neurochemical properties (2020) · cites this paper as Witter et al., 2000
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- Authors
- WITTER, M. P., WOUTERLOOD, F. G., NABER, P. A., & VAN HAEFTEN, T.
- Affiliations
- Vrije Universiteit Amsterdam (NL)
- Corresponding author
- WITTER, MENNO P.
- Venue
- Annals of the New York Academy of Sciences
- Publisher
- Wiley
- Published
- 2000-06
- Volume
- 911
- Issue
- 1
- Pages
- 1-24
- ISSN
- 0077-8923 (ISSN-L)
- 1749-6632
- OpenAlex
- W2018947767
- Cited by
- 567
- References
- 67
- Citations by year
- 2026: 15 · 2025: 15 · 2024: 27 · 2023: 16 · 2022: 19 · 2021: 29 · 2020: 22 · 2019: 14 · 2018: 27 · 2017: 28 · 2016: 31 · 2015: 21 · 2014: 26 · 2013: 20 · 2012: 22
- FWCI
- 1.21
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Annals of the New York Academy of Sciences (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
- Keywords
- entorhinal cortex, hippocampal formation, parallel circuits, CA1, subiculum, dentate gyrus, novelty detection
- MeSH terms
- Animals, Hippocampus, Humans, Nerve Net, Neural Pathways, Synaptic Transmission, Parahippocampal Gyrus
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