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Questions and Answers
Which cell type phagocytoses debris in an injured nerve fiber?
Which cell type phagocytoses debris in an injured nerve fiber?
What is the rate of axon growth during nerve fiber regeneration?
What is the rate of axon growth during nerve fiber regeneration?
What happens to the muscle fiber in the weeks following nerve fiber injury?
What happens to the muscle fiber in the weeks following nerve fiber injury?
What is the main change that takes place in an injured nerve fiber?
What is the main change that takes place in an injured nerve fiber?
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What happens to the Schwann cells in the weeks following nerve fiber injury?
What happens to the Schwann cells in the weeks following nerve fiber injury?
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What is the rate of nerve fiber regeneration?
What is the rate of nerve fiber regeneration?
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Study Notes
Phagocytosis of Debris in Injured Nerve Fibers
- Macrophages are the primary cell type that phagocytoses debris in injured nerve fibers, helping in clean-up and recovery.
Rate of Axon Growth During Regeneration
- Axons grow at a rate of approximately 1 mm per day during the regeneration process, facilitating the repair of nerve damage.
Changes in Muscle Fibers After Nerve Injury
- Following nerve fiber injury, muscle fibers undergo atrophy and degeneration within the first few weeks due to loss of innervation.
Main Changes in Injured Nerve Fibers
- The main change in an injured nerve fiber is wallerian degeneration, where the axon distal to the injury site degenerates, prompting the regeneration process.
Schwann Cells After Nerve Injury
- Schwann cells proliferate and dedifferentiate in the weeks after nerve fiber injury, which supports axon regrowth and myelin sheath reconstruction.
Overall Rate of Nerve Fiber Regeneration
- The overall rate of nerve fiber regeneration can vary but is generally comparable to the axonal growth rate of about 1 mm per day, leading to functional recovery over time.
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Description
Test your knowledge on the changes that occur in an injured peripheral nerve and the potential for axon regeneration with this quiz. Keywords: peripheral nerve, axon regeneration, injury, RER.