Intermediate Adductor Pollicis Quiz

Q1. Which structures contribute to the origin of the oblique head of adductor pollicis?

• Pisiform and base of the fifth metacarpal
• Scaphoid and first metacarpal shaft
• Capitate and bases of the second and third metacarpals
• Radius and ulna

Q2. From which part of the third metacarpal does the transverse head of adductor pollicis arise?

• Anterior surface of the shaft
• Lateral surface of the base only
• Dorsal surface of the head
• Metacarpophalangeal articular surface

Q3. Which spinal nerve roots contribute most commonly to the innervation of adductor pollicis?

• C3 and C4
• C5 and C6
• C6 and C7
• C8 and T1

Q4. Which nerve lesion would most directly weaken adductor pollicis?

• Musculocutaneous nerve lesion
• Ulnar nerve lesion
• Axillary nerve lesion
• Superficial radial nerve lesion

Q5. Which clinical test is commonly used to assess weakness of adductor pollicis?

• Finkelstein test
• Cozen test
• Froment test
• Phalen test

Q6. What compensatory movement produces a positive Froment sign when adductor pollicis is weak?

• Flexion of the thumb interphalangeal joint
• Flexion of the wrist
• Extension of the thumb interphalangeal joint
• Extension of the index finger

Q7. Which muscle produces the compensatory thumb interphalangeal flexion seen in a positive Froment sign?

• Abductor pollicis longus
• Extensor pollicis longus
• Flexor pollicis longus
• Extensor pollicis brevis

Q8. Which major arterial structure is closely related to the adductor pollicis in the deep palm?

• Brachial artery
• Superficial palmar arch only
• Deep palmar arch
• Anterior circumflex humeral artery

Q9. Which artery passes between the two heads of adductor pollicis to enter the palm?

• Brachial artery
• Ulnar artery
• Radial artery
• Anterior interosseous artery

Q10. Which statement best distinguishes adductor pollicis from most thenar muscles?

• It is supplied by the deep branch of the ulnar nerve
• It originates from the radius
• It is supplied by the posterior interosseous nerve
• It inserts on the distal phalanx of the thumb