Which condition results in the complete loss of motor function but leaves the nerve sheath intact?

Which condition results in the complete loss of motor function but leaves the nerve sheath intact?

• A. Neuropraxia
• B. Axonotmesis
• C. Neurotmesis
• D. Nerve compression

Answer: (B)

Axonotmesis is a condition characterized by the disruption of the axon within a nerve, while the surrounding nerve sheath remains intact. This type of injury often results from a more severe trauma compared to neuropraxia, leading to the complete loss of motor function and sensory loss distal to the injury site. However, the preservation of the nerve sheath allows for potential regeneration of the nerve fibers over time. In axonotmesis, the injury leads to Wallerian degeneration of the axon distal to the injury, which involves the breakdown of the axonal segment and the myelin sheath, but the connective tissue layers remain intact. This intact sheath provides a pathway for regrowth, and while this process can take weeks to months, it indicates that complete recovery can be expected in many cases. In contrast, neuropraxia typically sees a temporary loss of function due to a transient block in conduction, with the nerve sheath intact, resulting in a much quicker recovery, usually within days to weeks. Neurotmesis denotes a complete disruption of the nerve, including the sheath, leading to permanent loss of function unless surgical intervention is performed. Nerve compression generally refers to a situation where pressure on a nerve leads to symptoms like pain, numbness,

Axonotmesis is a condition characterized by the disruption of the axon within a nerve, while the surrounding nerve sheath remains intact. This type of injury often results from a more severe trauma compared to neuropraxia, leading to the complete loss of motor function and sensory loss distal to the injury site. However, the preservation of the nerve sheath allows for potential regeneration of the nerve fibers over time.

In axonotmesis, the injury leads to Wallerian degeneration of the axon distal to the injury, which involves the breakdown of the axonal segment and the myelin sheath, but the connective tissue layers remain intact. This intact sheath provides a pathway for regrowth, and while this process can take weeks to months, it indicates that complete recovery can be expected in many cases.

In contrast, neuropraxia typically sees a temporary loss of function due to a transient block in conduction, with the nerve sheath intact, resulting in a much quicker recovery, usually within days to weeks. Neurotmesis denotes a complete disruption of the nerve, including the sheath, leading to permanent loss of function unless surgical intervention is performed. Nerve compression generally refers to a situation where pressure on a nerve leads to symptoms like pain, numbness,