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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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Related Experiment Video

Updated: Sep 2, 2025

Facial Nerve Surgery in the Rat Model to Study Axonal Inhibition and Regeneration
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Facial Nerve Repair following Acute Nerve Injury.

Ehud Fliss1, Ravit Yanko1, Arik Zaretski1

  • 1Department of Plastic and Reconstructive Surgery, Tel-Aviv Sourasky Medical Center, Affiliated with the Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel.

Archives of Plastic Surgery
|August 3, 2022
PubMed
Summary

Prompt surgical repair of acute facial nerve injuries is crucial for restoring nerve continuity within 72 hours. Nerve repair up to six months post-injury can salvage facial function, while longstanding paralysis requires reanimation procedures.

Keywords:
facial nerve injuryfacial nerve traumafacial palsy

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Area of Science:

  • Neurosurgery
  • Plastic Surgery
  • Otolaryngology

Background:

  • Acute facial nerve injuries, whether iatrogenic or traumatic, necessitate prompt management to restore nerve continuity.
  • Reconstructive efforts for facial nerve repair can be successful up to 12 months post-injury, preserving facial tone and function.

Purpose of the Study:

  • To evaluate the outcomes of facial nerve repair following iatrogenic or traumatic injuries.
  • To determine the optimal timing and methods for facial nerve reconstruction.

Main Methods:

  • Retrospective analysis of patient data undergoing facial nerve repair for iatrogenic or traumatic injuries.
  • Assessment of paralysis etiology, demographics, operative details, and postoperative outcomes.

Main Results:

  • Iatrogenic injuries, primarily from parotidectomy for malignancy, were the most common cause (81%).
  • Nerve repair was often performed within 72 hours (75%) using nerve grafts (94%).
  • All patients with available outcomes experienced some facial paresis; 50% had complete paralysis, and 25% required secondary reanimation.

Conclusions:

  • Iatrogenic and traumatic facial nerve injuries are significant causes of acquired facial paralysis.
  • Immediate repair is recommended for acute injuries, with repair considered up to six months for delayed presentations.
  • Standard facial reanimation procedures are best for longstanding paralysis.