Paralysis of which muscle group results in total 'claw' hand?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $25.99Unlock all

Discover high-yield NBME Gross Anatomy concepts with quizzes designed to enhance your understanding. Equip yourself with flashcards, multiple-choice questions, and detailed explanations. Prepare effectively for your anatomy exam!

Multiple Choice

Paralysis of which muscle group results in total 'claw' hand?

Explanation:
Clawing of the hand happens when the intrinsic muscles that balance flexion at the metacarpophalangeal joints with extension at the interphalangeal joints are disrupted. The lumbricals normally flex the MCP joints and, by pulling on the extensor expansions, help extend the IP joints. When the lumbricals are paralyzed, the extensor digitorum acts unopposed at the MCP joints, causing hyperextension there, while the flexor digitorum profundus and superficialis pull the IP joints into flexion. This combination produces the characteristic claw-like deformity, especially noticeable when all lumbricals are affected.

Clawing of the hand happens when the intrinsic muscles that balance flexion at the metacarpophalangeal joints with extension at the interphalangeal joints are disrupted. The lumbricals normally flex the MCP joints and, by pulling on the extensor expansions, help extend the IP joints. When the lumbricals are paralyzed, the extensor digitorum acts unopposed at the MCP joints, causing hyperextension there, while the flexor digitorum profundus and superficialis pull the IP joints into flexion. This combination produces the characteristic claw-like deformity, especially noticeable when all lumbricals are affected.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy