Intermediate Palmaris Longus Quiz

Q1. Palmaris longus shares its proximal attachment with several superficial forearm muscles through which structure?

• Common extensor tendon
• Interosseous membrane
• Bicipital aponeurosis
• Common flexor tendon

Q2. Which spinal nerve roots are commonly associated with the motor supply of palmaris longus?

• C3 and C4
• T1 and T2 only
• C7 and C8
• C5 only

Q3. What is the relationship of the palmaris longus tendon to the flexor retinaculum?

• It passes superficial to the flexor retinaculum
• It passes through the carpal tunnel
• It passes beneath the extensor retinaculum
• It terminates proximal to the wrist

Q4. Does the palmaris longus tendon pass through the carpal tunnel?

• Yes, it passes through the tunnel with the ulnar nerve
• No, it passes superficial to the flexor retinaculum
• Yes, but only during wrist flexion
• Yes, it passes through the tunnel with the median nerve

Q5. Which nerve lies deep and slightly lateral to the palmaris longus tendon near the wrist?

• Ulnar nerve
• Axillary nerve
• Median nerve
• Posterior interosseous nerve

Q6. Which tendon generally lies lateral to the palmaris longus tendon at the distal anterior forearm?

• Extensor carpi ulnaris tendon
• Flexor carpi ulnaris tendon
• Extensor digiti minimi tendon
• Flexor carpi radialis tendon

Q7. Which tendon generally lies medial to palmaris longus at the distal anterior forearm?

• Extensor pollicis longus tendon
• Flexor carpi radialis tendon
• Flexor carpi ulnaris tendon
• Abductor pollicis longus tendon

Q8. Which maneuver can make the palmaris longus tendon prominent when the muscle is present?

• Oppose the thumb and little finger while flexing the wrist
• Extend the wrist while spreading the fingers
• Supinate the forearm while extending the thumb
• Extend the elbow while abducting the shoulder

Q9. Why does congenital absence of palmaris longus usually produce little or no functional deficit?

• Other muscles provide strong wrist flexion
• The tendon automatically regenerates after birth
• The muscle normally has no action
• The radial nerve replaces its motor supply

Q10. Which structure receives tension directly from the distal attachment of palmaris longus?

• Palmar aponeurosis
• Extensor retinaculum
• Interosseous membrane
• Dorsal digital expansion