Intermediate Brachialis Quiz

Q1. Which part of the humerus gives origin to most of the brachialis muscle?

• Distal half of the anterior surface
• Proximal half of the posterior surface
• Medial epicondyle only
• Greater tubercle only

Q2. Which spinal nerve roots contribute most prominently to the musculocutaneous innervation of brachialis?

• C1 and C2
• T1 and T2
• C8 and T1
• C5 and C6

Q3. Which nerve may provide additional innervation to the lateral part of the brachialis?

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

Q4. Which nerve passes between the biceps brachii and brachialis as it descends through the arm?

• Posterior interosseous nerve
• Ulnar nerve
• Musculocutaneous nerve
• Axillary nerve

Q5. After emerging lateral to the biceps tendon near the elbow, the musculocutaneous nerve continues as which nerve?

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

Q6. Which arteries contribute importantly to the blood supply of the brachialis?

• Axillary artery and thoracoacromial artery only
• Ulnar artery and posterior interosseous artery only
• Subclavian artery and internal thoracic artery
• Brachial artery and radial recurrent artery

Q7. Which structure forms much of the floor of the cubital fossa?

• Pronator teres
• Brachialis
• Brachioradialis
• Biceps brachii

Q8. Which structure lies immediately superficial to the brachialis within the cubital region?

• Biceps brachii
• Triceps brachii
• Supinator
• Anconeus

Q9. Why is brachialis often described as a primary or workhorse flexor of the elbow?

• It produces elbow flexion effectively regardless of forearm rotation
• It is the principal supinator of the forearm
• It crosses both the shoulder and elbow
• It extends the elbow during resisted movement

Q10. Which muscle is lateral to the distal brachialis near the elbow?

• Palmaris longus
• Flexor carpi ulnaris
• Brachioradialis
• Triceps brachii