Cerulospinal neurons are serotonergic neurons whose cell bodies are primarily located in the dorsal raphe nucleus (DRN) and median raphe nucleus (MRN) of the midbrain and pons, with axons that project downward through the cerulospinal tract to the spinal cord. These neurons represent a major component of the descending serotonergic modulatory system and play critical roles in pain processing, motor control, autonomic regulation, and mood.[1]
The cerulospinal system is closely related to the raphespinal system — "cerulospinal" historically refers to projections originating from nuclei adjacent to the locus coeruleus, while "raphespinal" refers to projections from the raphe nuclei. Modern neuroanatomy recognizes that both noradrenergic (locus coeruleus) and serotonergic (raphe nuclei) descending projections work together as part of the descending pain modulatory system.[2][3]
| Taxonomy | ID | Name / Label |
|---|---|---|
| Allen Brain Cell Atlas | Search | Cerulospinal Neurons |
| Cell Ontology (CL) | Search | Check classification |
| Human Cell Atlas | Search | Check expression data |
| CellxGene Census | Search | Check cell census |
Cerulospinal neurons receive input from:
The cerulospinal system is a key component of endogenous pain inhibition.[7]
Serotonergic dysfunction, including cerulospinal pathway alterations, contributes to multiple aspects of Parkinson's disease.[9]
ALS involves alterations in serotonergic signaling:[11]
Multiple System Atrophy involves cerulospinal pathway degeneration:
Alzheimer's disease affects the serotonergic system:
Huntington's disease shows early serotonergic dysfunction:
Gene therapy targeting 5-HT neurons
Cell transplantation for replacing lost neurons
Optogenetic modulation of cerulospinal pathways
Dorsal Raphe Nucleus
Serotonin
Pain Pathways
Descending Pain Modulation
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Basbaum AI, Fields HL. Endogenous pain control systems: brainstem spinal pathways and endorphin circuitry. Annu Rev Neurosci. 1984. ↩︎
Heinricher MM, Tavares I, Leith JL, Lumb BM. Descending control of nociception: Specificity, recruitment and plasticity. Brain Res Rev. 2009. ↩︎
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Mason P. Physiological identification of pontomedullary serotonergic neurons in the rat. J Neurophysiol. 1997. ↩︎
Aghajanian GK, Vandermaelen CP. Intracellular recordings from serotonergic dorsal raphe neurons: pacemaker potentials and the effect of LSD. Brain Res. 1982. ↩︎
Ossipov MH, Dussor GO, Porreca F. Central modulation of pain. J Clin Invest. 2010. ↩︎
Del Tredici K, Braak H. Dysfunction of the locus coeruleus-norepinephrine system and related circuitry in Parkinson's disease dementia. Neurology. 2013. ↩︎
Braak H, Del Tredici K, Rüb U, et al. Staging of brain pathology related to sporadic Parkinson's disease. Neurobiol Aging. 2003. ↩︎
Politis M, Oertel WH. Serotonin neurons in Parkinson's disease. Int Rev Neurobiol. 2017. ↩︎
Dentel C, Lušić I, Reynes C, et al. Specific alterations in the splicing pattern of 5-HT2C receptors in ALS. Neurobiol Dis. 2013. ↩︎