CNS nerves cannot regenerate. True or False?

CNS nerves cannot regenerate. True or False?

• A. True
• B. False
• C. Not sure
• D. Both can regenerate depending on location

Answer: (A)

In the adult nervous system, axons in the central nervous system generally do not regenerate after injury. This is because the CNS environment actively inhibits regrowth and forms barriers. Oligodendrocyte-derived inhibitors (such as Nogo-A) plus the glial scar produced by astrocytes block axon extension. Additionally, mature CNS neurons have limited intrinsic growth capacity. As a result, CNS injuries often result in lasting deficits rather than restoration of the original connections. There may be some plasticity and functional reorganization, but true axonal regeneration across long distances in the CNS is not expected. Hence, the statement is true.

In the adult nervous system, axons in the central nervous system generally do not regenerate after injury. This is because the CNS environment actively inhibits regrowth and forms barriers. Oligodendrocyte-derived inhibitors (such as Nogo-A) plus the glial scar produced by astrocytes block axon extension. Additionally, mature CNS neurons have limited intrinsic growth capacity. As a result, CNS injuries often result in lasting deficits rather than restoration of the original connections. There may be some plasticity and functional reorganization, but true axonal regeneration across long distances in the CNS is not expected. Hence, the statement is true.