Beginner Extensor Pollicis Brevis Quiz
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This quiz contains 10 questions. Click below to begin.
Q1. In which compartment of the forearm is extensor pollicis brevis located?
- Hypothenar compartment
- Posterior compartment
- Anterior compartment
- Thenar compartment
Q2. Extensor pollicis brevis belongs to which layer of the posterior forearm muscles?
- Superficial anterior layer
- Superficial layer
- Deep layer
- Intermediate anterior layer
Q3. From which forearm bone does extensor pollicis brevis primarily originate?
- Humerus
- Ulna
- Radius
- Scaphoid
Q4. Which membrane contributes to the origin of extensor pollicis brevis?
- Palmar aponeurosis
- Synovial membrane of the elbow
- Interosseous membrane
- Flexor retinaculum
Q5. Where does extensor pollicis brevis primarily insert?
- Base of the proximal phalanx of the thumb
- Pisiform
- Base of the fifth metacarpal
- Base of the distal phalanx of the thumb
Q6. What is the primary action of extensor pollicis brevis?
- Opposition of the thumb
- Extension of the thumb at the metacarpophalangeal joint
- Adduction of the thumb
- Flexion of the thumb at the interphalangeal joint
Q7. Which nerve supplies extensor pollicis brevis?
- Ulnar nerve
- Posterior interosseous nerve
- Anterior interosseous nerve
- Median nerve
Q8. The posterior interosseous nerve is derived from which major peripheral nerve?
- Median nerve
- Radial nerve
- Musculocutaneous nerve
- Ulnar nerve
Q9. Which digit is acted on by extensor pollicis brevis?
- Index finger
- Middle finger
- Thumb
- Little finger
Q10. In addition to extending the thumb, extensor pollicis brevis can assist which movement?
- Forearm pronation
- Radial deviation of the wrist
- Flexion of the little finger
- Ulnar deviation of the wrist