What is the correct description of a Type 1 nerve injury?

What is the correct description of a Type 1 nerve injury?

• A. Axonotmesis
• B. Conduction Block
• C. Neurotmesis
• D. Demyelination

Answer: (B)

The situation is describing neurapraxia, where the myelin around the nerve is temporarily damaged but the axon itself remains intact. This causes a conduction block—impulses cannot traverse the affected segment even though the nerve fibers are still connected to their targets. Since the axon isn’t broken and there’s no distal degeneration, recovery happens as the myelin is repaired, usually quite quickly. So, the best way to describe Type 1 injury is as a conduction block due to demyelination with preserved axons. Axon damage (axonotmesis) would show distal degeneration and slower, longer recovery; complete nerve disruption (neurotmesis) would require surgical repair. Demyelination explains the underlying process, but the functional description that fits Type 1 best is a conduction block.

The situation is describing neurapraxia, where the myelin around the nerve is temporarily damaged but the axon itself remains intact. This causes a conduction block—impulses cannot traverse the affected segment even though the nerve fibers are still connected to their targets. Since the axon isn’t broken and there’s no distal degeneration, recovery happens as the myelin is repaired, usually quite quickly.

So, the best way to describe Type 1 injury is as a conduction block due to demyelination with preserved axons. Axon damage (axonotmesis) would show distal degeneration and slower, longer recovery; complete nerve disruption (neurotmesis) would require surgical repair. Demyelination explains the underlying process, but the functional description that fits Type 1 best is a conduction block.