Beevor's Sign indicates involvement of which muscle group?

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Study for the NATA BOC Domain 2 Clinical Evaluation and Diagnosis Test. Utilize our comprehensive flashcards and multiple-choice quiz features; each question comes with hints and thorough explanations. Prepare effectively for your certification exam!

Multiple Choice

Beevor's Sign indicates involvement of which muscle group?

Explanation:
Beevor's sign reflects weakness of the abdominal wall musculature. When a person tries to flex the trunk or perform a sit-up, the upper part of the rectus abdominis and other upper abdominal muscles contract strongly, but the lower fibers are too weak to contribute. This imbalance causes the umbilicus to be pulled upward toward the head. The test therefore indicates involvement of the abdominal muscles, which are innervated by thoracic nerves (roughly between T6 and T12). The sign is not a marker of the back (paraspinal) muscles or of the shoulder or intercostal muscles.

Beevor's sign reflects weakness of the abdominal wall musculature. When a person tries to flex the trunk or perform a sit-up, the upper part of the rectus abdominis and other upper abdominal muscles contract strongly, but the lower fibers are too weak to contribute. This imbalance causes the umbilicus to be pulled upward toward the head. The test therefore indicates involvement of the abdominal muscles, which are innervated by thoracic nerves (roughly between T6 and T12). The sign is not a marker of the back (paraspinal) muscles or of the shoulder or intercostal muscles.

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