Question

which cervical nerve root is matched with the correct motor strength test?
c5/biceps and deltoid
c7/wrist extension
c6/wrist flexion
c8/wrist extension
c4/biceps and deltoid

Explanation:

• C5: Innervates biceps (flexion of elbow) and deltoid (abduction of shoulder).
• C6: Associated with wrist extension (extensor carpi radialis longus and brevis).
• C7: Associated with triceps (extension of elbow).
• C8: Associated with finger flexion.
• C4: Innervates the diaphragm (main muscle for breathing) rather than biceps and deltoid.

Answer:

C5/biceps and deltoid