Definition and research guide
This page combines a MeSH definition, publication statistics and selected research abstracts. It is a starting point for reading the literature, not a medical textbook or a systematic evidence review.
Content available: 4 complete abstracts (718 words), 10 references. Full article text is not stored or reproduced here; follow the PMID, DOI or PMC links to read the original sources and their access terms.
Definition
The front part of the hindbrain (rhombencephalon) that lies between the medulla and the midbrain (mesencephalon) ventral to the cerebellum. It is composed of two parts, the dorsal and the ventral. The pons serves as a relay station for neural pathways between the cerebellum to the cerebrum.
Definition: NLM Medical Subject Headings (MeSH) scope note (Public domain (U.S. National Library of Medicine); attribution requested). View the MeSH record.
Also known as: Pons Varolii; Pons Varolius; Varolii, Pons; Varolius, Pons; Ponte; Pontes.
Where it fits in the MeSH classification
- Broader topics
- Metencephalon
- Narrower topics
- Barrington's Nucleus; Cochlear Nucleus; Kolliker-Fuse Nucleus; Middle Cerebellar Peduncle; Pontine Tegmentum; Vestibular Nuclei
Related concepts
- Rhombencephalon
- Medulla
- Mesencephalon
- Cerebellum
- Cerebrum
Research landscape
PubMed indexes 28,536 records tagged with the MeSH heading “Pons” (counts retrieved 2026-10-29). 2,151 of them (7.5%) were published from 2020 onward, and the busiest period so far is through 1999 with 16,536 records.
Reviews account for 1,604 records (5.6%) and meta-analyses for 12. Randomized controlled trials number 46 (0.2%) as a share of all records on the topic. Randomized trials make up only a small share of this literature, so much of what is known comes from laboratory, observational or descriptive work.
Show the data
| Period | Records |
|---|---|
| through 1999 | 16,536 |
| 2000-2009 | 5,611 |
| 2010-2019 | 4,238 |
| 2020 onward | 2,151 |
Publication-type chart data
| Type | Records | Share |
|---|---|---|
| Reviews | 1,604 | 5.6% |
| Meta-analyses | 12 | 0.0% |
| Randomized controlled trials | 46 | 0.2% |
Method: PubMed query "Pons"[MeSH Terms] with publication-type and date filters, retrieved 2026-10-29.
Reading the evidence in neuroscience
Neuroscience draws on tools with different strengths: cellular and animal work can manipulate circuits directly, while human imaging and electrophysiology observe the living brain at lower resolution. Small imaging studies are prone to false positives, and findings in animals do not always carry over to people. Clinical neurology and psychiatry rely on trials and cohort studies whose outcomes are often symptom scales. Check the species, the sample size, how the outcome was measured and whether results were replicated.
Evidence from open-access studies
These open-access studies come from PubMed’s best-match results for this heading (papers whose main topic it is), ranked here by citation count, with one recent addition. Each abstract is reproduced in full under its recorded open licence so that you can read the authors’ own words. They illustrate the literature; they are not a systematic summary of it. Citation counts measure attention, not reliability or clinical benefit.
| Study / authors | Year | Source label / design | Europe PMC citations | Licence / source |
|---|---|---|---|---|
| Tonic and burst-like locus coeruleus stimulation distinctly shift network activity across the cortical hierarchy | 2024 | Research article Design not recorded in structured metadata | 91 | cc by PMID 39284964 · DOI · PMC11537968 |
| A spatially-resolved transcriptional atlas of the murine dorsal pons at single-cell resolution | 2024 | Research article Design not recorded in structured metadata | 62 | cc by PMID 38438345 · DOI · PMC10912765 |
| Centripetal integration of past events in hippocampal astrocytes regulated by locus coeruleus | 2024 | Research article Design not recorded in structured metadata | 62 | cc by PMID 38570661 · DOI · PMC11089000 |
| Non-rapid eye movement sleep and isoflurane-induced anesthesia show divergent subcortical connectivity patterns during transition phases in mice | 2026 | Research article Design not recorded in structured metadata | 3 | cc by PMID 40990322 · DOI · PMC13089457 |
Tonic and burst-like locus coeruleus stimulation distinctly shift network activity across the cortical hierarchy [1]
Abstract reading summary — source excerpts
- Opening excerpt
- Noradrenaline (NA) release from the locus coeruleus (LC) changes activity and connectivity in neuronal networks across the brain, modulating multiple behavioral states.
- Closing excerpt
- Together, these findings reveal how the LC-NA system achieves a nuanced regulation of global circuit operations.
- Interpretation limits
- Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (145 words)
Noradrenaline (NA) release from the locus coeruleus (LC) changes activity and connectivity in neuronal networks across the brain, modulating multiple behavioral states. NA release is mediated by both tonic and burst-like LC activity. However, it is unknown whether the functional changes in target areas depend on these firing patterns. Using optogenetics, photometry, electrophysiology and functional magnetic resonance imaging in mice, we show that tonic and burst-like LC firing patterns elicit brain responses that hinge on their distinct NA release dynamics. During moderate tonic LC activation, NA release engages regions associated with associative processing, while burst-like stimulation biases the brain toward sensory processing. These activation patterns locally couple with increased astrocytic and inhibitory activity and change the brain's topological configuration in line with the hierarchical organization of the cerebral cortex. Together, these findings reveal how the LC-NA system achieves a nuanced regulation of global circuit operations.
Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 39284964 · DOI · PMC11537968
A spatially-resolved transcriptional atlas of the murine dorsal pons at single-cell resolution [2]
Abstract reading summary — source excerpts
- Opening excerpt
- The "dorsal pons", or "dorsal pontine tegmentum" (dPnTg), is part of the brainstem.
- Closing excerpt
- ai:6273/ ) that combines interactive visual analytics and hardware-accelerated SQL into a data science framework to allow the scientific community to query and gain insights into the data.
- Interpretation limits
- Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (183 words)
The "dorsal pons", or "dorsal pontine tegmentum" (dPnTg), is part of the brainstem. It is a complex, densely packed region whose nuclei are involved in regulating many vital functions. Notable among them are the parabrachial nucleus, the Kölliker Fuse, the Barrington nucleus, the locus coeruleus, and the dorsal, laterodorsal, and ventral tegmental nuclei. In this study, we applied single-nucleus RNA-seq (snRNA-seq) to resolve neuronal subtypes based on their unique transcriptional profiles and then used multiplexed error robust fluorescence in situ hybridization (MERFISH) to map them spatially. We sampled ~1 million cells across the dPnTg and defined the spatial distribution of over 120 neuronal subtypes. Our analysis identified an unpredicted high transcriptional diversity in this region and pinpointed the unique marker genes of many neuronal subtypes. We also demonstrated that many neuronal subtypes are transcriptionally similar between humans and mice, enhancing this study's translational value. Finally, we developed a freely accessible, GPU and CPU-powered dashboard ( http://harvard.heavy.ai:6273/ ) that combines interactive visual analytics and hardware-accelerated SQL into a data science framework to allow the scientific community to query and gain insights into the data.
Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 38438345 · DOI · PMC10912765
Centripetal integration of past events in hippocampal astrocytes regulated by locus coeruleus [3]
Abstract reading summary — source excerpts
- Opening excerpt
- An essential feature of neurons is their ability to centrally integrate information from their dendrites.
- Closing excerpt
- Together, our results suggest that astrocytes are computational units of the brain that slowly and conditionally integrate calcium signals upon behaviorally relevant events.
- Interpretation limits
- Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (150 words)
An essential feature of neurons is their ability to centrally integrate information from their dendrites. The activity of astrocytes, in contrast, has been described as mostly uncoordinated across cellular compartments without clear central integration. Here we report conditional integration of calcium signals in astrocytic distal processes at their soma. In the hippocampus of adult mice of both sexes, we found that global astrocytic activity, as recorded with population calcium imaging, reflected past neuronal and behavioral events on a timescale of seconds. Salient past events, indicated by pupil dilations, facilitated the propagation of calcium signals from distal processes to the soma. Centripetal propagation to the soma was reproduced by optogenetic activation of the locus coeruleus, a key regulator of arousal, and reduced by pharmacological inhibition of α1-adrenergic receptors. Together, our results suggest that astrocytes are computational units of the brain that slowly and conditionally integrate calcium signals upon behaviorally relevant events.
Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 38570661 · DOI · PMC11089000
Non-rapid eye movement sleep and isoflurane-induced anesthesia show divergent subcortical connectivity patterns during transition phases in mice [4]
Abstract reading summary — source excerpts
- Opening excerpt
- Study objectivesNeural dynamics underlying anesthesia-induced unconsciousness are not fully understood.
- Closing excerpt
- ConclusionsThe present study revealed functional connectivity patterns between VLPO and LC during sleep and isoflurane anesthesia, suggesting that these processes partly do not share similar functional connectivity patterns for the two nuclei.
- Interpretation limits
- Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (240 words)
Study objectivesNeural dynamics underlying anesthesia-induced unconsciousness are not fully understood. Given the parallels between natural sleep and anesthesia-induced unconsciousness, it becomes imperative to understand the neuronal mechanisms behind these two distinct yet seemingly interconnected states. This study investigated the interplay between sleep/wake-promoting nuclei during WAKE/non-rapid eye movement sleep (NREMS) transitions and the reversible loss and recovery of responsiveness (LOR/ROR) induced by isoflurane.MethodsLocal field potentials (LFPs) were recorded from the ventrolateral preoptic area (VLPO) and locus coeruleus (LC) in mice alongside chronic electroencephalogram-recordings. After baseline recordings, a slow induction regime of isoflurane anesthesia followed. Functional connectivity between VLPO and LC during NREMS, WAKE, LOR, and ROR was studied using coherence, inter-site phase clustering, and Granger causality analyses.ResultsLFP data revealed an increase in coherence between VLPO and LC during NREMS and a decrease during WAKE. Coherence decreased after LOR. During ROR, coherence did not change. Phase clustering between VLPO and LC increased during NREMS and decreased during WAKE, while across LOR/ROR transitions did not vary. Granger between VLPO and LC during WAKE/NREM transitions demonstrated bidirectional influences of the two nuclei. VLPO Granger caused LC during NREMS. In the slow-wave frequency, the Granger index from LC to VLPO decreased during NREMS, while after ROR, the Granger index from VLPO to LC increased.ConclusionsThe present study revealed functional connectivity patterns between VLPO and LC during sleep and isoflurane anesthesia, suggesting that these processes partly do not share similar functional connectivity patterns for the two nuclei.
Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 40990322 · DOI · PMC13089457
Key reviews and meta-analyses
The most cited review-type papers among PubMed’s best-match results for this heading, listed with bibliographic details only. Follow the links for the full text and access terms.
- Research article An integrative theory of locus coeruleus-norepinephrine function: adaptive gain and optimal performance [5]
- Research article The locus coeruleus and noradrenergic modulation of cognition [6]
- Research article Decision making, the P3, and the locus coeruleus-norepinephrine system [7]
- Research article Orienting and reorienting: the locus coeruleus mediates cognition through arousal [8]
- Research article Role of locus coeruleus in attention and behavioral flexibility [9]
- Research article Locus coeruleus: a new look at the blue spot [10]
References
- Grimm C, Duss SN, Privitera M, Munn BR, Karalis N, Frässle S, et al.. Tonic and burst-like locus coeruleus stimulation distinctly shift network activity across the cortical hierarchy. . 2024. PMID 39284964 · DOI · PMC11537968
- Nardone S, De Luca R, Zito A, Klymko N, Nicoloutsopoulos D, Amsalem O, et al.. A spatially-resolved transcriptional atlas of the murine dorsal pons at single-cell resolution. . 2024. PMID 38438345 · DOI · PMC10912765
- Rupprecht P, Duss SN, Becker D, Lewis CM, Bohacek J, Helmchen F. Centripetal integration of past events in hippocampal astrocytes regulated by locus coeruleus. . 2024. PMID 38570661 · DOI · PMC11089000
- Joyce L, Nuttall R, Kreuzer M, Rammes G, Schneider G, Fenzl T. Non-rapid eye movement sleep and isoflurane-induced anesthesia show divergent subcortical connectivity patterns during transition phases in mice. . 2026. PMID 40990322 · DOI · PMC13089457
- Aston-Jones G, Cohen JD. An integrative theory of locus coeruleus-norepinephrine function: adaptive gain and optimal performance. Annu Rev Neurosci. 2005. PMID 16022602 · DOI
- Sara SJ. The locus coeruleus and noradrenergic modulation of cognition. Nat Rev Neurosci. 2009. PMID 19190638 · DOI
- Nieuwenhuis S, Aston-Jones G, Cohen JD. Decision making, the P3, and the locus coeruleus-norepinephrine system. Psychol Bull. 2005. PMID 16060800 · DOI
- Sara SJ, Bouret S. Orienting and reorienting: the locus coeruleus mediates cognition through arousal. Neuron. 2012. PMID 23040811 · DOI
- Aston-Jones G, Rajkowski J, Cohen J. Role of locus coeruleus in attention and behavioral flexibility. Biol Psychiatry. 1999. PMID 10560036 · DOI
- Poe GR, Foote S, Eschenko O, Johansen JP, Bouret S, Aston-Jones G, et al.. Locus coeruleus: a new look at the blue spot. Nat Rev Neurosci. 2020. PMID 32943779 · DOI · PMC8991985
About this article
- Sources
- NLM Medical Subject Headings (definition, synonyms); NCBI PubMed (counts, identifiers); Europe PMC (open-access abstracts and citation counts).
- Verification
- Every reference was resolved against PubMed on 2026-10-31; title, year and DOI matched.
- Review state
- automated source verified; no human expert review has been recorded yet.
- Version
- 1, last updated 2026-10-29.
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Evidence strength
EvidenceHelix's computed view of the study designs behind this topic: how common meta-analyses, randomized trials and reviews are, how recent the literature is, and a plain-language reading. It describes the design mix of the literature. It is not a quality appraisal of any study, and it is not medical advice.