Regeneration of nerve fibers in the central nervous system is highly unlikely because:
A) there are no neurolemmas (sheaths of Schwann).
B) oligodendrocytes inhibit axon regeneration.
C) astrocytes rapidly form a physical barrier of scar tissue.
D) all of these choices

Question

Quizplus · Accepted Answer

All of these choices contribute to the difficulty of nerve fiber regeneration in the central nervous system. Neurolemmas, or Schwann cell sheaths, are crucial for the regeneration of nerve fibers in the peripheral nervous system but are absent in the central nervous system. Oligodendrocytes, which myelinate CNS axons, release factors that inhibit axon regeneration. Astrocytes form scar tissue that physically blocks axon regrowth after injury.

Regeneration of Nerve Fibers in the Central Nervous System Is