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Related Experiment Video

Updated: Jun 20, 2026

Modified Spared Nerve Injury Surgery Model of Neuropathic Pain in Mice
04:34

Modified Spared Nerve Injury Surgery Model of Neuropathic Pain in Mice

Published on: January 25, 2022

Cutting your nerve changes your brain.

Keri S Taylor1, Dimitri J Anastakis, Karen D Davis

  • 1Division of Brain, Imaging and Behaviour - Systems Neuroscience, Toronto Western Research Institute, University Health Network, Toronto, Canada.

Brain : a Journal of Neurology
|September 10, 2009
PubMed
Summary
This summary is machine-generated.

Brain structure changes after upper limb nerve repair correlate with sensory recovery. Reduced grey matter in somatosensory areas links to poorer function, offering therapeutic insights.

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08:16

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Published on: October 6, 2022

Area of Science:

  • Neuroscience
  • Neuroplasticity
  • Rehabilitation Medicine

Background:

  • Peripheral nerve injuries impact sensorimotor function, with variable recovery outcomes.
  • Brain plasticity is known in animal models, but human brain changes post-nerve repair are understudied.
  • The relationship between nerve regeneration, brain structural changes, and functional recovery requires characterization.

Purpose of the Study:

  • To investigate functional and structural brain changes following peripheral nerve transection and surgical repair in humans.
  • To determine if brain plasticity (grey and white matter) correlates with sensory recovery.
  • To explore the link between peripheral nerve regeneration and central nervous system alterations.

Main Methods:

  • Assessed peripheral nerve regeneration via nerve conduction studies.
  • Measured functional magnetic resonance imaging (fMRI) brain activation (blood oxygen level dependent signal; BOLD) during vibrotactile stimulation.
  • Examined grey and white matter structural plasticity using MRI.
  • Correlated sensory recovery measures with structural brain changes.

Main Results:

  • Peripheral nerve repair patients showed impaired nerve conduction 1.5 years post-surgery.
  • Altered BOLD activity was observed in somatosensory cortices and the 'task positive network' compared to controls.
  • Grey matter reductions in contralesional somatosensory cortices correlated with reduced BOLD signal.
  • Grey matter thinning in the post-central gyrus negatively correlated with sensory recovery (mechanical and vibration detection).
  • Reduced white matter fractional anisotropy was found in the right insula.

Conclusions:

  • Peripheral nerve injury and repair induce significant functional and structural brain changes.
  • Brain structural alterations, particularly grey matter thinning, are linked to impaired sensory function.
  • These findings highlight structure-function relationships in nerve injury recovery and inform therapeutic strategies.