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Regeneration and retrograde degeneration of axons in the rat optic nerve

  • Published:
Journal of Neurocytology

Summary

The retinal stump of the rat optic nerve was examined histologically 1–64 weeks after intracranial section of the nerve with or without grafting of autologous peripheral nerve segments. Single unmyelinated axons and bundles of unmyelinated axons appeared in cut optic nerves and were most abundant 2–4 weeks after section. With light and electron microscope radioautography after injection of tritiated amino acids into the globe, it was confirmed that many unmyelinated fibres arose from the optic nerve rather than from nearby peripheral nerves and it was estimated that some axons regenerated as far as 0.5 mm. At or near the end of retinofugal axons, structures resembling growth cones were seen at 2 weeks and vesicle-containing swellings similar to synapses were found at 1–2 months. Outgrowth from optic nerve axons was not obviously enhanced by peripheral nerve grafts although a few retinofugal axons became ensheathed by Schwann cells. Retrograde axonal degeneration was rapid in both cut and grafted optic nerves, the number of nerve fibres near the globe falling to less than 10% of normal after 4 weeks. A few myelinated and unmyelinated fibres were still present 64 weeks after nerve transection. In conclusion, some cut axons in the rat optic nerve display a transient regenerative response before undergoing retrograde degeneration.

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Authors and Affiliations

  1. Neurosciences Unit, Montreal General Hospital and Department of Neurology and Neurosurgery, McGill University, Montreal, Canada

    P. M. Richardson, V. M. K. Issa & S. Shemie

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  1. P. M. Richardson
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  2. V. M. K. Issa
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  3. S. Shemie
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Richardson, P.M., Issa, V.M.K. & Shemie, S. Regeneration and retrograde degeneration of axons in the rat optic nerve. J Neurocytol 11, 949–966 (1982). https://doi.org/10.1007/BF01148310

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  • DOI: https://doi.org/10.1007/BF01148310

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