Central Nervous System

The central nervous system (CNS) comprises the brain and spinal cord, serving as the primary integrative and command centre for the body. Structurally, the spinal cord relays sensory information from peripheral receptors to the brain and conveys motor commands to muscles, while also orchestrating reflex circuits. The brainstem, perched atop the spinal cord, regulates vital autonomic functions and houses the nuclei of most cranial nerves. Above it, the cerebellum fine-tunes movement and balance through its highly regular circuitry, whereas the diencephalon—including the thalamus and hypothalamus—filters sensory inputs and controls homeostasis through neuroendocrine and autonomic pathways. The cerebrum, with its folded six-layered cortex and extensive white-matter tracts, underlies perception, voluntary action, cognition and emotion. Within the cortex and its subcortical nuclei, specialised networks process and integrate sensory, motor and limbic information, enabling learning, memory and adaptive behaviour. Supporting cells—astrocytes, oligodendrocytes and microglia—maintain homeostasis, myelinate axons and survey the parenchyma, respectively, while a perivascular “glymphatic” system clears metabolic waste. Precise chemical and electrical synapses distribute excitatory and inhibitory signals via neurotransmitters such as glutamate, GABA, acetylcholine, monoamines and peptides. Together, these components form a modular yet highly interconnected organ that mediates all aspects of sensation, thought and action.

Research from Nature Portfolio

Seminal work on microglia has illuminated their dual roles in health and disease. Early characterisation revealed that unregulated microglial activation can release neurotoxic mediators, including reactive oxygen species, contributing to neuronal injury in degenerative disorders. Subsequent studies have defined how interferon-γ primes microglia through STAT1-driven assembly of the NLRP3 inflammasome, exaggerating cytokine release and behavioural deficits; inhibition of this axis restores homeostasis and mitigates cell death. These advances establish microglia as both guardians and potential aggressors within the CNS, highlighting finely tuned inflammatory regulation as a therapeutic target.

Research from all publishers

Ultra-rapid structural MRI protocols, under one-minute in duration, have been validated in older adults with and without neurodegenerative disease. These accelerated scans yield cortical thickness and volumetric measures comparable to conventional longer acquisitions, preserving sensitivity to region-specific atrophy while reducing motion artefact and cost. Another multi-cohort analysis has documented consistently greater male than female variance in subcortical volumes, cortical surface areas and thickness across the lifespan, implying early-emerging genetic or developmental influences on anatomical variability. Finally, comparative morphometric studies across primate species demonstrate that cortical folding follows a scale-free, fractal trajectory characterised by a universal fractal dimension; this framework enhances detection of age-related change and may inform novel biomarkers of neurodegeneration.

Central Nervous System publication trend

The graph below shows the total number of articles in central nervous system across all publications each year (not limited to Nature Index journals).

Technical terms

Glymphatic system: A perivascular network driven by astrocytic aquaporin-4 channels that clears interstitial solutes from the brain.

NLRP3 inflammasome: A cytosolic protein complex in microglia that activates caspase-1, promoting maturation of interleukin-1β and interleukin-18.

Microglial priming: A state in which microglia exhibit exaggerated inflammatory responses to subsequent stimuli, often following interferon-γ exposure.

Ultra-rapid MRI: High-speed structural imaging sequences capable of acquiring T1-weighted data in under one minute with clinical accuracy.

Fractal dimension: A quantitative measure of complexity that describes how cortical folding patterns scale across spatial resolutions.

References

1. Microglial priming by IFN‐γ involves STAT1‐mediated activation of the NLRP3 inflammasome. CNS Neuroscience & Therapeutics (2024).
2. Microglia-mediated neurotoxicity: uncovering the molecular mechanisms. Nature Reviews Neuroscience (2007).
3. Brain morphometry in older adults with and without dementia using extremely rapid structural scans. NeuroImage (2023).
4. Greater male than female variability in regional brain structure across the lifespan. Human Brain Mapping (2020).
5. Neuro-evolutionary evidence for a universal fractal primate brain shape. eLife (2024).