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Neurogenesis and Regeneration of Nervous Tissue01:15

Neurogenesis and Regeneration of Nervous Tissue

In the CNS, neurogenesis, the birth of new neurons from stem cells, is limited to the hippocampus in adults. In other regions of the brain and spinal cord, neurogenesis is almost non-existent due to inhibitory influences from neuroglia, especially oligodendrocytes, and the absence of growth-stimulating cues. The myelin produced by oligodendrocytes in the CNS inhibits neuronal regeneration. Furthermore, astrocytes proliferate rapidly after neuronal damage, forming scar tissue that physically...
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Spinal cord injury progresses through two interconnected phases: primary injury and secondary injury.Primary InjuryPrimary injury happens at the moment of trauma and involves immediate mechanical damage to the spinal cord.Compression happens when broken vertebrae, herniated discs, or accumulating blood (such as a hematoma) press directly against the spinal cord, distorting its normal shape and function. In cases of contusion, the cord is bruised by a blunt force (like penetrating injuries or...
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Dorsal Root Ganglion Injection and Dorsal Root Crush Injury as a Model for Sensory Axon Regeneration
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Dorsal Root Ganglion Injection and Dorsal Root Crush Injury as a Model for Sensory Axon Regeneration

Published on: May 3, 2017

Regeneration after spinal nerve root injury.

T Carlstedt1, M Risling, H Lindå

  • 1Department of Hand Surgery, Sabbatsbergs Hospital, Karolinska Institutet, S-104 01 Stockholm (Sweden) Department of Anatomy, Karolinska Institutet, S-104 01 Stockholm (Sweden).

Restorative Neurology and Neuroscience
|May 10, 2011
PubMed
Summary

Spinal nerve root avulsion, once deemed irreparable, shows potential for motor neuron regeneration within the spinal cord. This regeneration enables reinnervation of muscles, offering hope for functional recovery after injury.

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Last Updated: Jun 2, 2026

Dorsal Root Ganglion Injection and Dorsal Root Crush Injury as a Model for Sensory Axon Regeneration
09:48

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Combining Peripheral Nerve Grafting and Matrix Modulation to Repair the Injured Rat Spinal Cord
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Combining Peripheral Nerve Grafting and Matrix Modulation to Repair the Injured Rat Spinal Cord

Published on: November 20, 2009

Area of Science:

  • Neuroscience
  • Regenerative Medicine
  • Spinal Cord Injury Research

Background:

  • Spinal nerve root avulsion is a severe central nervous system injury.
  • Historically, surgical repair has not been considered feasible for these injuries in humans.
  • Understanding axonal regeneration is crucial for developing therapeutic strategies.

Purpose of the Study:

  • To investigate the potential for axonal regeneration after spinal nerve root avulsion or lesion.
  • To explore the functional recovery of skeletal muscles following nerve root repair.
  • To differentiate regenerative capabilities between ventral and dorsal nerve roots.

Main Methods:

  • Utilized advanced neurophysiological, morphological, and tracing techniques in laboratory animal models.
  • Examined alpha and gamma motoneuron regeneration after ventral root avulsion and reimplantation into the spinal cord.
  • Assessed regeneration following dorsal root injury in adult and immature animals.

Main Results:

  • Alpha and gamma motoneurons successfully regenerated within the spinal cord after ventral root avulsion and implantation.
  • Regenerated neurons reinnervated denervated skeletal muscles, responding to afferent activity and conducting action potentials.
  • No significant regeneration into the spinal cord was observed after dorsal root injury in adult animals.
  • Primary sensory neuron regeneration into the spinal cord was demonstrated in immature animals.

Conclusions:

  • Ventral root avulsion allows for significant axonal regeneration and functional muscle reinnervation within the central nervous system.
  • Regenerative capacity differs between ventral and dorsal nerve roots, with age playing a role in sensory neuron regeneration.
  • These findings challenge previous notions about the irreparability of spinal nerve root avulsions and suggest potential therapeutic avenues.