Intermediate Supinator Quiz

Q1. Which ligament contributes to the proximal attachment of the supinator?

• Coracoacromial ligament
• Annular ligament of the radius
• Transverse carpal ligament
• Ulnar collateral ligament of the wrist

Q2. Which nerve passes between the superficial and deep parts of the supinator?

• Median nerve
• Superficial branch of the radial nerve
• Deep branch of the radial nerve
• Ulnar nerve

Q3. What is the arcade of Frohse?

• The distal edge of pronator quadratus
• A ligament spanning the carpal tunnel
• The proximal edge of the superficial part of the supinator
• A tendon connecting biceps brachii to the ulna

Q4. What is the deep branch of the radial nerve generally called after it emerges from the supinator?

• Medial cutaneous nerve of the forearm
• Anterior interosseous nerve
• Posterior interosseous nerve
• Superficial radial nerve

Q5. Which part of the radius is surrounded by the insertion of the supinator?

• Distal third
• Distal articular surface only
• Radial styloid only
• Proximal third

Q6. Which joint permits rotation of the radial head during the action of the supinator?

• Radiocarpal joint
• Acromioclavicular joint
• First carpometacarpal joint
• Proximal radioulnar joint

Q7. Which description best explains how the supinator produces its action?

• It rotates the ulna medially around a fixed radius
• It flexes the radius at the wrist
• It rotates the proximal radius laterally
• It pulls the radial head distally without rotation

Q8. Compared with biceps brachii, the supinator is particularly useful for which type of supination?

• Unresisted or low force supination
• Finger extension against resistance
• Wrist flexion against resistance
• Pronation against heavy resistance

Q9. Which spinal nerve roots are commonly associated with the motor supply of the supinator?

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

Q10. Which muscle can be palpated or tested functionally with the supinator when the forearm is rotated from pronation toward the palm-up position?

• Pronator quadratus
• Flexor digitorum profundus
• Biceps brachii
• Extensor digiti minimi