Intermediate Extensor Carpi Radialis Brevis Quiz

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

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

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

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

Q3. Which structure holds the extensor carpi radialis brevis tendon close to the dorsal wrist?

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

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

• Base of the first metacarpal
• Base of the third metacarpal
• Base of the second metacarpal
• Base of the fifth metacarpal

Q5. Which spinal nerve roots are commonly associated with the motor supply of extensor carpi radialis brevis?

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

Q6. Which muscle can act with extensor carpi radialis brevis to extend the wrist while reducing radial deviation?

• Flexor carpi radialis
• Extensor carpi ulnaris
• Flexor digitorum superficialis
• Pronator teres

Q7. Which muscle can act with extensor carpi radialis brevis to produce radial deviation while reducing the extension component?

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

Q8. What is the functional importance of wrist extension by extensor carpi radialis brevis during forceful gripping?

• It prevents all movement at the metacarpophalangeal joints
• It produces thumb opposition during gripping
• It helps place the finger flexors at a favorable length for gripping
• It directly flexes the distal phalanges

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

• Resisted wrist extension with radial deviation
• Resisted finger abduction
• Resisted forearm pronation
• Resisted wrist flexion with ulnar deviation

Q10. Which statement best describes the position of extensor carpi radialis brevis relative to extensor carpi radialis longus in the proximal forearm?

• It lies medial to flexor carpi ulnaris in the anterior forearm
• It lies superficial to brachioradialis throughout its entire course
• It lies entirely within the anterior compartment
• It lies medial and somewhat deep to extensor carpi radialis longus