Intermediate Extensor Carpi Radialis Longus Quiz

Q1. Through which dorsal extensor compartment does the tendon of extensor carpi radialis longus pass at the wrist?

• Sixth compartment
• First compartment
• Third compartment
• Second compartment

Q2. Which tendon accompanies extensor carpi radialis longus through the second dorsal extensor compartment?

• Extensor carpi ulnaris
• Extensor carpi radialis brevis
• Abductor pollicis longus
• Extensor pollicis longus

Q3. Which structure holds the extensor carpi radialis longus tendon against the dorsal wrist?

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

Q4. Which insertion distinguishes extensor carpi radialis longus from extensor carpi radialis brevis?

• Distal phalanx of the thumb
• Base of the second metacarpal
• Base of the fifth metacarpal
• Base of the third metacarpal

Q5. Which spinal nerve roots are most commonly associated with the innervation of extensor carpi radialis longus?

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

Q6. Which muscle lies immediately lateral to extensor carpi radialis longus in the proximal forearm?

• Brachioradialis
• Extensor carpi ulnaris
• Flexor carpi ulnaris
• Pronator quadratus

Q7. Which muscle can act with extensor carpi radialis longus to produce relatively balanced wrist extension with less radial or ulnar deviation?

• Pronator teres
• Palmaris longus
• Flexor carpi radialis
• Extensor carpi ulnaris

Q8. Which muscle can act with extensor carpi radialis longus to reinforce radial deviation while their opposing flexion and extension actions partly balance?

• Flexor carpi ulnaris
• Flexor carpi radialis
• Flexor digitorum profundus
• Extensor carpi ulnaris

Q9. How can extensor carpi radialis longus function be assessed clinically?

• Resisted thumb opposition
• Resisted wrist flexion with ulnar deviation
• Resisted finger adduction
• Resisted wrist extension with radial deviation

Q10. Why can extensor carpi radialis longus contribute to a strong grip?

• It directly adducts all of the fingers
• It directly flexes the distal phalanges
• It stabilizes the wrist in a position favorable for the finger flexors
• It prevents contraction of the finger extensors