Intermediate Extensor Indicis Quiz

Q1. Through which dorsal extensor compartment does the extensor indicis tendon pass at the wrist?

• Fifth compartment
• Sixth compartment
• Second compartment
• Fourth compartment

Q2. Which tendons share the fourth dorsal compartment with extensor indicis?

• Extensor digitorum tendons
• Extensor pollicis longus tendon
• Extensor digiti minimi tendon
• Extensor carpi ulnaris tendon

Q3. Which structure holds the extensor indicis tendon close to the dorsal wrist?

• Palmar aponeurosis
• Bicipital aponeurosis
• Flexor retinaculum
• Extensor retinaculum

Q4. Which other muscle normally provides an extensor tendon to the index finger?

• Flexor carpi radialis
• Extensor pollicis brevis
• Extensor digiti minimi
• Extensor digitorum

Q5. Why can the index finger be extended relatively independently of the other fingers?

• It has no extensor digitorum tendon
• It is extended primarily by flexor digitorum profundus
• It has a dedicated extensor indicis tendon
• It lacks an extensor expansion

Q6. Which spinal nerve roots are commonly associated with the motor supply of extensor indicis?

• T1 and T2
• C3 and C4
• C7 and C8
• C5 and C6

Q7. How does extensor indicis contribute to extension of the interphalangeal joints of the index finger?

• Through the palmar aponeurosis
• Through the flexor retinaculum
• Through the carpal tunnel
• Through the extensor expansion

Q8. Where is the extensor indicis tendon typically positioned relative to the extensor digitorum tendon to the index finger on the dorsum of the hand?

• On the palmar surface of the tendon
• Directly within the carpal tunnel
• On its radial side
• On its ulnar side

Q9. How can extensor indicis function be assessed clinically?

• Resisted flexion of the index finger
• Resisted thumb opposition
• Resisted extension of the index finger
• Resisted forearm pronation

Q10. Which feature distinguishes the proximal attachment of extensor indicis from that of extensor digitorum?

• Origin from the medial epicondyle through the common flexor tendon
• Origin from the base of the second metacarpal
• Origin from the radial styloid
• Origin from the posterior distal ulna and interosseous membrane