Beginner Extensor Indicis Quiz

Q1. In which compartment of the forearm is extensor indicis located?

• Thenar compartment
• Posterior compartment
• Hypothenar compartment
• Anterior compartment

Q2. Extensor indicis belongs to which layer of the posterior forearm muscles?

• Deep layer
• Intermediate anterior layer
• Superficial anterior layer
• Superficial layer

Q3. From which forearm bone does extensor indicis primarily originate?

• Ulna
• Radius
• Scaphoid
• Humerus

Q4. Which membrane contributes to the proximal attachment of extensor indicis?

• Synovial membrane of the elbow
• Interosseous membrane
• Flexor retinaculum
• Palmar aponeurosis

Q5. Which digit is specifically acted on by extensor indicis?

• Index finger
• Middle finger
• Ring finger
• Little finger

Q6. What is the primary action of extensor indicis?

• Opposition of the index finger
• Adduction of the thumb
• Flexion of the index finger
• Extension of the index finger

Q7. Into which structure does the extensor indicis tendon insert?

• Extensor expansion of the index finger
• Base of the first metacarpal
• Flexor sheath of the index finger
• Palmar aponeurosis

Q8. Which nerve supplies extensor indicis?

• Median nerve
• Anterior interosseous nerve
• Ulnar nerve
• Posterior interosseous nerve

Q9. The posterior interosseous nerve is derived from which major peripheral nerve?

• Ulnar nerve
• Musculocutaneous nerve
• Median nerve
• Radial nerve

Q10. In addition to extending the index finger, extensor indicis can assist which movement?

• Thumb opposition
• Wrist extension
• Forearm pronation
• Wrist flexion