Advanced Flexor Carpi Radialis Muscle Quiz

Q1. A proximal median nerve injury would be expected to affect flexor carpi radialis in which way?

• Finger abduction would be selectively lost
• Wrist flexion and radial deviation would be weakened
• Wrist extension and ulnar deviation would be weakened
• Elbow extension would be abolished

Q2. Why is flexor carpi radialis usually unaffected by isolated ulnar nerve injury?

• It is innervated by the median nerve
• It receives no motor innervation
• It is supplied only by the anterior interosseous nerve
• It is innervated by the radial nerve

Q3. A patient with weakness of flexor carpi ulnaris but preserved flexor carpi radialis may show what tendency during attempted wrist flexion?

• Ulnar deviation
• Radial deviation
• Forearm supination only
• Finger abduction

Q4. Why does flexor carpi radialis produce radial deviation in addition to wrist flexion?

• Its tendon crosses the wrist on the radial side of the joint axis
• It inserts on the fifth metacarpal
• Its tendon crosses behind the medial epicondyle
• It attaches to the distal phalanges

Q5. Which statement correctly distinguishes the flexor carpi radialis tendon from the digital flexor tendons at the wrist?

• It terminates proximal to the wrist
• It shares the same synovial sheath as all digital flexor tendons
• It passes dorsal to the extensor retinaculum
• It passes through a separate fibro-osseous canal rather than the carpal tunnel proper

Q6. Pain localized along the flexor carpi radialis tendon near the volar radial wrist and worsened by resisted wrist flexion may suggest which condition?

• Cubital tunnel syndrome
• Triceps tendon rupture
• Posterior interosseous nerve palsy
• Flexor carpi radialis tendinopathy

Q7. The distal flexor carpi radialis tendon is clinically useful as a landmark for locating which vessel?

• Ulnar artery
• Deep brachial artery
• Posterior interosseous artery
• Radial artery

Q8. If both flexor carpi radialis and extensor carpi radialis longus contract together, which movement is reinforced while their opposing sagittal plane actions tend to balance?

• Radial deviation
• Forearm pronation
• Finger flexion
• Ulnar deviation

Q9. Which finding would best demonstrate that flexor carpi radialis is functioning during examination?

• Extension of the distal interphalangeal joints
• Abduction of the fingers against resistance
• Extension of the elbow against resistance
• A palpable tendon during resisted wrist flexion and radial deviation

Q10. Which description best summarizes the anatomy of flexor carpi radialis?

• It is a deep radial nerve supplied muscle that extends and ulnarly deviates the wrist
• It is an ulnar nerve supplied finger flexor inserting on the distal phalanges
• It is a superficial median nerve supplied forearm muscle that flexes and radially deviates the wrist and inserts mainly on the second metacarpal
• It is a posterior forearm muscle that extends the thumb