When weakness results from nerve pressure:

When weakness results from nerve pressure:

• 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)

Weakness from nerve pressure means the problem lies in the nerve itself. The nerve’s job is to transmit motor signals from the nervous system to the muscle. When the nerve is compressed, those signals are blocked or slowed, so the muscle fibers don’t receive proper instructions to contract, causing weakness in the muscles that the nerve supplies. This differs from a primary muscle problem, where the nerve is functioning normally but the muscle tissue itself is unable to respond. If both muscle and nerve were involved, the pattern of weakness would be broader or follow different diagnostic clues, whereas nerve compression points to the nerve as the site of the lesion.

Weakness from nerve pressure means the problem lies in the nerve itself. The nerve’s job is to transmit motor signals from the nervous system to the muscle. When the nerve is compressed, those signals are blocked or slowed, so the muscle fibers don’t receive proper instructions to contract, causing weakness in the muscles that the nerve supplies. This differs from a primary muscle problem, where the nerve is functioning normally but the muscle tissue itself is unable to respond. If both muscle and nerve were involved, the pattern of weakness would be broader or follow different diagnostic clues, whereas nerve compression points to the nerve as the site of the lesion.