Intermediate Extensor Digitorum Quiz
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This quiz contains 10 questions. Click below to begin.
Q1. Through which dorsal extensor compartment do the extensor digitorum tendons pass at the wrist?
- Sixth compartment
- Second compartment
- Fourth compartment
- First compartment
Q2. Which other tendon shares the fourth dorsal extensor compartment with the extensor digitorum tendons?
- Extensor indicis
- Extensor pollicis longus
- Extensor digiti minimi
- Extensor carpi ulnaris
Q3. Which structure holds the extensor digitorum tendons close to the dorsal wrist?
- Bicipital aponeurosis
- Flexor retinaculum
- Palmar aponeurosis
- Extensor retinaculum
Q4. What are the intertendinous connections between extensor digitorum tendons on the dorsum of the hand called?
- Juncturae tendinum
- Vincula tendinum
- Annular pulleys
- Oblique retinacular ligaments
Q5. What is an important functional consequence of the juncturae tendinum?
- They attach the flexor tendons to the carpal bones
- They can limit completely independent finger extension
- They flex the distal interphalangeal joints
- They prevent all wrist extension
Q6. Which spinal nerve roots are commonly associated with the motor supply of extensor digitorum?
- C7 and C8
- C5 only
- C3 and C4
- T1 and T2 only
Q7. How does extensor digitorum contribute to extension of the proximal and distal interphalangeal joints?
- Through the palmar aponeurosis
- Through the carpal tunnel
- Through the flexor retinaculum
- Through the extensor expansions
Q8. Which muscles join the extensor expansions and assist extension of the interphalangeal joints?
- Pronator teres and pronator quadratus
- Flexor carpi radialis and flexor carpi ulnaris
- Lumbricals and interossei
- Thenar muscles only
Q9. How can extensor digitorum function be assessed clinically?
- Resisted thumb opposition
- Resisted flexion of digits 2 to 5 at the distal interphalangeal joints
- Resisted extension of digits 2 to 5 at the metacarpophalangeal joints
- Resisted forearm pronation
Q10. Why can the index finger often be extended more independently than some other fingers?
- It is extended by flexor digitorum profundus
- It is supplied by the ulnar nerve only
- It receives an additional tendon from extensor indicis
- It has no connection to extensor digitorum