Which muscle action is extension and abduction at the wrist?

Which muscle action is extension and abduction at the wrist?

• A. Flexion and Adduction at the Wrist
• B. Extension and Abduction at the Wrist
• C. Extension at Finger Joints
• D. Inspiration

Answer: (B)

Motion at the wrist combines extension or flexion with deviation toward the thumb side (radial/abduction) or the little finger side (ulnar/adduction). The described action—extension plus abduction—matches what the extensor carpi radialis longus and brevis do: they extend the wrist and pull it toward the radius, producing radial deviation. The extensor carpi ulnaris extends the wrist but causes adduction (ulnar deviation), not abduction. Extending at finger joints or inspiration has nothing to do with wrist movement. So the best fit is extension with abduction at the wrist.

Motion at the wrist combines extension or flexion with deviation toward the thumb side (radial/abduction) or the little finger side (ulnar/adduction). The described action—extension plus abduction—matches what the extensor carpi radialis longus and brevis do: they extend the wrist and pull it toward the radius, producing radial deviation. The extensor carpi ulnaris extends the wrist but causes adduction (ulnar deviation), not abduction. Extending at finger joints or inspiration has nothing to do with wrist movement. So the best fit is extension with abduction at the wrist.