Advanced Brachioradialis Quiz

Q1. Which nerve is tested in part by the brachioradialis reflex?

• Axillary nerve
• Ulnar nerve
• Median nerve
• Radial nerve

Q2. Which spinal segment is most strongly associated with the brachioradialis reflex?

• C6
• C4
• C8
• T1

Q3. Where is the brachioradialis tendon typically struck when eliciting its deep tendon reflex?

• Just proximal to the radial styloid
• Over the pisiform
• Directly over the olecranon
• At the medial epicondyle

Q4. A radial nerve lesion in the axilla would be expected to have what effect on brachioradialis?

• Weakness or paralysis of brachioradialis
• No effect because it is supplied by the median nerve
• Increased brachioradialis strength
• No effect because it is supplied by the musculocutaneous nerve

Q5. Why can elbow flexion remain possible after loss of brachioradialis function?

• Pronator quadratus becomes the primary elbow flexor
• Extensor digitorum substitutes for elbow flexion
• Brachialis and biceps brachii can still flex the elbow
• Triceps brachii becomes an elbow flexor

Q6. Which relationship makes brachioradialis an important landmark for locating the radial artery in the forearm?

• The radial artery passes through the carpal tunnel with its tendon
• The radial artery runs entirely medial to flexor carpi ulnaris
• The radial artery passes through the muscle belly
• The radial artery runs along its medial side and emerges more superficially distally

Q7. What happens to the superficial branch of the radial nerve near the distal border of brachioradialis?

• It joins the ulnar nerve at the wrist
• It passes through pronator quadratus
• It enters the carpal tunnel
• It emerges from beneath brachioradialis and becomes subcutaneous

Q8. Why is brachioradialis particularly effective during a hammer-curl type movement?

• The forearm is forced into maximal supination
• The wrist is maximally extended
• The forearm is maintained near the neutral position
• The elbow remains fully extended throughout the movement

Q9. A patient can flex the elbow strongly when the forearm is supinated but shows greater weakness when flexing with the forearm in neutral. Dysfunction of which muscle could contribute to this pattern?

• Brachioradialis
• Pronator quadratus
• Triceps brachii
• Extensor indicis

Q10. Which description best summarizes the anatomy of brachioradialis?

• It is a radial nerve supplied posterior compartment muscle that inserts on the distal radius and primarily flexes the elbow
• It is a median nerve supplied anterior compartment muscle that flexes the wrist
• It is a radial nerve supplied muscle that inserts on the olecranon and primarily extends the elbow
• It is an ulnar nerve supplied deep flexor that inserts on the distal phalanges