If weakness is due to nerve pressure, which structure is primarily affected?

If weakness is due to nerve pressure, which structure is primarily affected?

• A. The muscle
• B. Neither the muscle nor the nerve is in lesion
• C. The nerve
• D. Both muscle and nerve are in lesion

Answer: (C)

The main idea is that weakness caused by nerve compression points to the nerve as the primary site of the problem. When a nerve is under pressure, the motor signals it carries to the muscle are disrupted, so the muscle can’t contract with normal strength. The muscle itself isn’t the initial lesion in this scenario; it only shows reduced function because the nerve’s input is impaired. The muscle could become affected secondarily if denervation continues, but the immediate cause is the nerve.

The main idea is that weakness caused by nerve compression points to the nerve as the primary site of the problem. When a nerve is under pressure, the motor signals it carries to the muscle are disrupted, so the muscle can’t contract with normal strength. The muscle itself isn’t the initial lesion in this scenario; it only shows reduced function because the nerve’s input is impaired. The muscle could become affected secondarily if denervation continues, but the immediate cause is the nerve.