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PHA-L analysis of projections from the supramammillary nucleus in the rat

Vertes, Robert P.·1992·Journal of Comparative Neurology

Abstract

The projections of the supramammillary nucleus (SUM) were examined in the rat by the anterograde anatomical tracer Phaseolus vulgaris leucoagglutinin (PHA-L). The majority of labeled fibers from SUM ascended through the forebrain within the medial forebrain bundle. SUM fibers were found to terminate heavily in the hippocampal formation, specifically within the granule cell layer and immediately adjoining molecular layer of the dentate gyrus. In addition, SUM fibers were shown to distribute densely to several structures with strong connections with the hippocampus, namely, the nucleus reunions of the thalamus, the medial and lateral septum, the entorhinal cortex, and the endopiriform nucleus. SUM fibers were also shown to project significantly to several additional subcortical and cortical sites. The subcortical sites were the dorsal raphe nucleus, the midbrain central gray, the fields of Forel/zona incerta, the dorsomedial hypothalamic area, midline/intralaminar nuclei of the thalamus (posterior paraventricular, rhomboid, central medial, intermediodorsal, and mediodorsal), the medial and lateral preoptic areas, the bed nucleus of the stria terminalis, the substantia innominata, the vertical limb of the diagonal band nucleus, and the claustrum. The cortical sites were the occipital, temporal, parietal, and frontal cortices. Some notable differences were observed in projections from the lateral as compared to the medial SUM. For example, fibers originating from the lateral SUM distributed heavily to the hippocampal formation and parts of the cortex, whereas those from the medial SUM projected sparsely to these two regions. The SUM projections to the hippocampal formation and associated structures may serve as the substrate for a SUM involvement in the generation of the theta rhythm of the hippocampus and the gating of information flow through the hippocampal formation.

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Crossref · 10.1002/cne.903260408

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Authors
Vertes, R. P.
Affiliations
Florida Atlantic University (US)
Corresponding author
Vertes, Robert P.
Venue
Journal of Comparative Neurology
Publisher
Wiley
Published
1992-12-22
Volume
326
Issue
4
Pages
595-622
ISSN
  • 0021-9967 (ISSN-L)
  • 1096-9861
OpenAlex
W2029127832
Cited by
299
References
92
Citations by year
2026: 11 · 2025: 4 · 2024: 9 · 2023: 14 · 2022: 14 · 2021: 10 · 2020: 7 · 2019: 10 · 2018: 6 · 2017: 10 · 2016: 8 · 2015: 10 · 2014: 9 · 2013: 7 · 2012: 11
FWCI
3.82
Type
journal article
Language
en
Open access
closed
Locations
  • The Journal of Comparative Neurology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5r01mh045075-06)
  • National Institute of Mental Health (MH-45075)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
Keywords
supramammillary nucleus, anterograde tracing, Phaseolus vulgaris leucoagglutinin, hippocampal formation, dentate gyrus, medial forebrain bundle, thalamic nuclei, septum, entorhinal cortex, endopiriform nucleus, dorsal raphe nucleus, thalamus, preoptic area, bed nucleus of the stria terminalis, substantia innominata, diagonal band of Brodmann, claustrum, theta oscillations
MeSH terms
Animals, Cerebral Cortex, Hippocampus, Male, Mammillary Bodies, Mesencephalon, Neural Pathways, Phytohemagglutinins, Prosencephalon, Rats, Sprague-Dawley, Rats

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