Cited by 277Memory and Neural MechanismsNeural dynamics and brain functionNeuroscience and Neuropharmacology Research

Anatomical substrates for direct interactions between hippocampus, medial prefrontal cortex, and the thalamic nucleus reuniens

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Varela, C., Kumar, S., Yang, J. Y., Wilson, M. A.·2014·Brain Structure and Function

Abstract

The reuniens nucleus in the midline thalamus projects to the medial prefrontal cortex (mPFC) and the hippocampus, and has been suggested to modulate interactions between these regions, such as spindle-ripple correlations during sleep and theta band coherence during exploratory behavior. Feedback from the hippocampus to the nucleus reuniens has received less attention but has the potential to influence thalamocortical networks as a function of hippocampal activation. We used the retrograde tracer cholera toxin B conjugated to two fluorophores to study thalamic projections to the dorsal and ventral hippocampus and to the prelimbic and infralimbic subregions of mPFC. We also examined the feedback connections from the hippocampus to reuniens. The goal was to evaluate the anatomical basis for direct coordination between reuniens, mPFC, and hippocampus by looking for double-labeled cells in reuniens and hippocampus. In confirmation of previous reports, the nucleus reuniens was the origin of most thalamic afferents to the dorsal hippocampus, whereas both reuniens and the lateral dorsal nucleus projected to ventral hippocampus. Feedback from hippocampus to reuniens originated primarily in the dorsal and ventral subiculum. Thalamic cells with collaterals to mPFC and hippocampus were found in reuniens, across its anteroposterior axis, and represented, on average, about 8 % of the labeled cells in reuniens. Hippocampal cells with collaterals to mPFC and reuniens were less common (~1 % of the labeled subicular cells), and located in the molecular layer of the subiculum. The results indicate that a subset of reuniens cells can directly coordinate activity in mPFC and hippocampus. Cells with collaterals in the hippocampus-reuniens-mPFC network may be important for the systems consolidation of memory traces and for theta synchronization during exploratory behavior.

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  1. Jones EG The thalamus 2007 Cambridge University Press London

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Authors
Varela, C., Kumar, S., Yang, J. Y., & Wilson, M. A.
Affiliations
Massachusetts Institute of Technology (US)
Corresponding author
Varela, C.
Venue
Brain Structure and Function
Published
2013-04-10
Volume
219
Issue
3
Pages
911-929
ISSN
  • 1863-2653 (ISSN-L)
  • 1863-2661
OpenAlex
W1981683953
Cited by
277
References
69
Citations by year
2026: 21 · 2025: 18 · 2024: 25 · 2023: 16 · 2022: 29 · 2021: 34 · 2020: 27 · 2019: 18 · 2018: 26 · 2017: 23 · 2016: 16 · 2015: 13 · 2014: 7 · 2013: 4
FWCI
7.28
Type
journal article
Language
en
Open access
Locations
  • Brain Structure and Function (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • DSpace@MIT (Massachusetts Institute of Technology) (submittedVersion, cc-by-nc-sa)
  • PMC
Funders
  • National Institute of Mental Health (R01MH061976)
  • National Institute of General Medical Sciences (R01GM104948)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
nucleus reuniens, medial prefrontal cortex, hippocampus, thalamocortical connections, dorsal hippocampus, ventral hippocampus, subiculum, prelimbic cortex, infralimbic cortex, retrograde tracing, cholera toxin B, thalamocortical network, memory consolidation, theta synchronization, sleep spindles
MeSH terms
Animals, Hippocampus, Male, Memory, Neural Pathways, Neurons, Thalamic Nuclei, Prefrontal Cortex, Rats, Long-Evans

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