Related Experiment Videos
Peripheral axotomy induces neurofilament decrease, atrophy, demyelination and degeneration of root and fasciculus
Brain Research
|August 5, 1985
Summary
Peripheral nerve injury in cats causes progressive axonal degeneration and myelin damage. Primary sensory neurons are more vulnerable than motor neurons, impacting functional recovery after nerve damage.
Area of Science:
- Neuroscience
- Pathology
- Cell Biology
Background:
- Peripheral axotomy, such as hindlimb amputation, induces sequential changes in nerve fibers.
- Previous studies demonstrated neurofilament decrease, axonal atrophy, and myelin alterations post-axotomy.
Purpose of the Study:
- To investigate neuropathologic and morphometric alterations in nerve roots and fasciculus gracilis 24 months after hindlimb amputation in adult cats.
- To compare the vulnerability of primary afferent neurons versus lower motor neurons to axotomy.
Main Methods:
- Hindlimb amputation in adult cats.
- Neuropathologic examination of myelinated fibers in nerve roots and fasciculus gracilis.
- Morphometric analysis and teased fiber studies.
Main Results:
- Severe neurofilament decrease, axonal atrophy, myelin wrinkling, de-/remyelination, and axonal loss in posterior root axons.
- Morphologic abnormalities extended proximally into the fasciculus gracilis.
- Retrograde effects were less severe in ventral root fibers but showed atrophy and sprouting.
Conclusions:
- Primary afferent neurons are more susceptible to axotomy than lower motor neurons.
- Findings suggest retrograde degeneration in ascending axons mirrors proximal stump changes.
- Observed features in nerve roots and fasciculus gracilis may result from peripheral nerve axotomy, not primary pathology.