Nucleus raphe magnus
cluster of nuclei in the brain stem
The nucleus raphe magnus (NRM) is one of the seven raphe nuclei. It is situated in the pons in the brainstem, just rostral to the nucleus raphe obscurus.
The NRM receives afferent stimuli from the enkephalinergic neurons of the periaqueductal gray; the serotonergic neurons of the NRM then bilaterally project efferents to the enkephalinergic and dynorphin-containing interneurons of the substantia gelatinosa of the posterior grey column of the spinal cord. This neural path thus mediates pain perception through pre-synaptic inhibition of first-order afferent (sensory) neurons.
Anatomy
Afferents
It receives afferents from the spinal cord and cerebellum.
It receives descending afferents from the periaqueductal grey matter (PAG), the paraventricular hypothalamic nucleus, central nucleus of the amygdala, lateral hypothalamic area, parvocellular reticular nucleus and the prelimbic, infralimbic, medial and lateral precentral cortices. It is one of the afferent targets of the ascending reticular activating system.
Efferents
It projects efferents to the posterior grey column (to modulate pain).
Neurophysiology and function
The nucleus raphe magnus seems to participate in the endogenous analgesia system. Mounting evidence suggests that the nucleus raphe magnus plays an important role in homeostatic regulation.
The public source identifies “Nucleus raphe magnus” as cluster of nuclei in the brain stem. This brief keeps that definition visible, then builds a research path around Nucleus, raphe and magnus.
Why this record matters
A short description can identify a subject without explaining its stakes. For “Nucleus raphe magnus”, the useful work is to connect “cluster of nuclei in the brain stem” to the records capable of establishing context and consequence.
Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Aug 27, 2024. The linked authority identifier is Q17143534. None of the 0 selected statements returned an explicit reference.
The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.
- Subject orientation
- Search vocabulary
- Locating named sources
The closest primary source, responsible institution and strongest cited specialist reference.
Three-step research path
- Establish the record: confirm the title “Nucleus raphe magnus”, its source revision and the description used here.
- Expand the search: follow Nucleus raphe magnus primary sources, Nucleus raphe magnus archive and Nucleus research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Nucleus raphe magnus”?
- Which institution is responsible for the underlying evidence?
- What terminology or title could unlock a more precise catalogue search?
Search terms from this dossier
This entry incorporates text from “Nucleus raphe magnus” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.