Intermediate Pronator Quadratus Quiz

Q1. Which portions of the radius and ulna are connected by pronator quadratus?

• Distal radius and distal ulna
• Proximal radius and proximal ulna
• Distal humerus and proximal radius
• Radius and humerus

Q2. What is the general orientation of the fibers of pronator quadratus?

• Predominantly transverse
• Predominantly vertical
• Longitudinal into the fingers
• Spiraling around the humerus

Q3. Which structure lies superficial to pronator quadratus in the distal anterior forearm?

• Long flexor tendons
• Anconeus
• Extensor retinaculum
• Supinator

Q4. Which nerve descends on the anterior surface of the interosseous membrane toward pronator quadratus?

• Posterior interosseous nerve
• Anterior interosseous nerve
• Superficial radial nerve
• Dorsal cutaneous branch of the ulnar nerve

Q5. Which artery accompanies the anterior interosseous nerve toward pronator quadratus?

• Superior ulnar collateral artery
• Anterior interosseous artery
• Deep brachial artery
• Posterior circumflex humeral artery

Q6. Which spinal nerve roots are commonly associated with the innervation of pronator quadratus?

• C3 and C4
• C8 and T1
• T2 and T3 only
• C5 and C6 only

Q7. During pronation, how does the radius move relative to the ulna?

• The ulna crosses over the radius
• Both bones remain completely stationary
• The radius moves directly away from the ulna without rotation
• The radius crosses over the ulna

Q8. Which statement best describes the role of pronator quadratus in ordinary pronation?

• It is an important prime mover of forearm pronation
• It acts only when the elbow is fully extended
• It produces supination during unresisted movement
• It acts only on the wrist joint

Q9. How does pronator quadratus contribute to distal radioulnar joint stability?

• It separates the distal radius from the ulna
• It stabilizes the humeral head in the glenoid
• It locks the elbow in extension
• It helps hold the distal radius and ulna together

Q10. Why does pronator quadratus have little direct effect on wrist flexion or extension?

• It inserts into the palmar aponeurosis
• It does not cross the wrist joint
• It is supplied by the radial nerve
• It is located entirely within the hand