Advanced Palmaris Longus Quiz

Q1. Why is the palmaris longus tendon commonly considered for use as a tendon graft?

• Its removal strengthens the median nerve
• It is the only muscle capable of wrist flexion
• It has no attachment to the forearm
• Its tendon is long and expendable with minimal functional loss

Q2. Which anatomical feature should be confirmed before planning to harvest palmaris longus as a graft?

• Presence of the posterior interosseous nerve
• Presence of the palmaris longus tendon
• Fusion of the radius and ulna
• Absence of the flexor retinaculum

Q3. Why is the palmaris longus tendon an important surface landmark near the wrist?

• The posterior interosseous nerve crosses it at the palm
• The ulnar artery lies inside its tendon
• The radial nerve passes through its tendon
• The median nerve lies deep to it near the wrist

Q4. Which feature distinguishes palmaris longus from the flexor tendons that pass through the carpal tunnel?

• It passes through the carpal tunnel beside flexor digitorum profundus
• It passes superficial to the flexor retinaculum
• It passes through Guyon's canal with the ulnar nerve
• It passes beneath the extensor retinaculum

Q5. A patient lacks a visible palmaris longus tendon during standard clinical testing but has normal wrist flexion. What is the most likely explanation?

• The patient cannot have a palmar aponeurosis
• The flexor retinaculum must be absent
• Congenital absence of palmaris longus
• Complete median nerve paralysis is certain

Q6. A reversed palmaris longus variant differs from the usual configuration in which way?

• The muscle inserts on the distal phalanx of the thumb
• The muscle belly is positioned distally rather than proximally
• The muscle is supplied by the radial nerve
• The muscle becomes part of the posterior compartment

Q7. Why can a reversed or hypertrophied palmaris longus occasionally become clinically significant?

• It prevents elbow extension
• It may contribute to nerve compression near the wrist
• It always causes rupture of the radial artery
• It causes obligatory dislocation of the ulna

Q8. Why is palmaris longus considered functionally less important for wrist flexion than flexor carpi radialis and flexor carpi ulnaris?

• It is a relatively weak wrist flexor
• It does not cross the wrist
• It acts only on the elbow
• It is an extensor rather than a flexor

Q9. A surgeon identifies a superficial tendon in the midline of the distal anterior forearm that becomes prominent with wrist flexion and thumb to little finger opposition. Which tendon is most likely being observed?

• Palmaris longus tendon
• Flexor pollicis longus tendon
• Flexor digitorum profundus tendon to the index finger
• Extensor pollicis longus tendon

Q10. Which description best summarizes the anatomy of palmaris longus?

• It is an intrinsic hand muscle that abducts the thumb
• It is a posterior radial nerve supplied muscle that extends the wrist
• It is a superficial median nerve supplied forearm muscle that weakly flexes the wrist and tenses the palmar aponeurosis
• It is a deep ulnar nerve supplied muscle that flexes the distal interphalangeal joints