Dorsal interossei actions include which two movements?

Dorsal interossei actions include which two movements?

• A. Adduct and Extend
• B. Flex and Extend
• C. Abduct and Flex
• D. Abduct and Extend

Answer: (C)

Dorsal interossei primarily move the fingers away from the middle finger, causing abduction. They also assist in bending the metacarpophalangeal joints (flexion) and, through the extensor mechanism, help straighten the finger’s interphalangeal joints (extension). When asked for two movements, the clearest pair of actions is abducting the digits and flexing the metacarpophalangeal joints. They do not produce adduction (that’s the palmar interossei) and their role in IP extension is a secondary effect to the main actions.

Dorsal interossei primarily move the fingers away from the middle finger, causing abduction. They also assist in bending the metacarpophalangeal joints (flexion) and, through the extensor mechanism, help straighten the finger’s interphalangeal joints (extension). When asked for two movements, the clearest pair of actions is abducting the digits and flexing the metacarpophalangeal joints. They do not produce adduction (that’s the palmar interossei) and their role in IP extension is a secondary effect to the main actions.