Intermediate Extensor Pollicis Brevis Quiz
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This quiz contains 10 questions. Click below to begin.
Q1. Through which dorsal extensor compartment does the tendon of extensor pollicis brevis pass at the wrist?
- Third compartment
- Fourth compartment
- First compartment
- Second compartment
Q2. Which tendon accompanies extensor pollicis brevis through the first dorsal compartment?
- Extensor carpi ulnaris
- Extensor pollicis longus
- Abductor pollicis longus
- Extensor indicis
Q3. Extensor pollicis brevis forms part of which boundary of the anatomical snuffbox?
- Medial boundary
- Proximal boundary formed by the radius
- Lateral boundary
- Bony floor
Q4. Which tendon forms the medial boundary of the anatomical snuffbox?
- Extensor pollicis brevis
- Extensor pollicis longus
- Abductor pollicis longus
- Flexor pollicis longus
Q5. Which artery crosses the floor of the anatomical snuffbox deep to the tendons forming its boundaries?
- Ulnar artery
- Brachial artery
- Common interosseous artery
- Radial artery
Q6. Which spinal nerve roots are commonly associated with the motor supply of extensor pollicis brevis?
- C7 and C8
- T1 and T2
- C3 and C4
- C5 only
Q7. Which thumb joint is most directly extended by extensor pollicis brevis?
- Interphalangeal joint
- Radiocarpal joint
- Distal radioulnar joint
- Metacarpophalangeal joint
Q8. Which muscle is primarily responsible for extension of the distal phalanx of the thumb at the interphalangeal joint?
- Flexor pollicis brevis
- Extensor pollicis brevis
- Abductor pollicis longus
- Extensor pollicis longus
Q9. How can extensor pollicis brevis function be assessed clinically?
- Resisted flexion of the index finger
- Resisted adduction of the thumb
- Resisted extension of the thumb at the metacarpophalangeal joint
- Resisted flexion of the thumb at the interphalangeal joint
Q10. Which feature best distinguishes the insertion of extensor pollicis brevis from that of extensor pollicis longus?
- It inserts on the distal radius rather than the thumb
- It inserts on the proximal rather than distal phalanx
- It inserts on the pisiform rather than a phalanx
- It inserts on the fifth metacarpal rather than the thumb