Intermediate Coracobrachialis Quiz
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This quiz contains 10 questions. Click below to begin.
Q1. Which spinal nerve roots contribute to the innervation of the coracobrachialis through the musculocutaneous nerve?
- T1 to T3
- C8 to T1
- C1 to C3
- C5 to C7
Q2. From which cord of the brachial plexus does the musculocutaneous nerve arise before piercing coracobrachialis?
- Posterior cord
- Inferior trunk
- Lateral cord
- Medial cord
Q3. After piercing coracobrachialis, where does the musculocutaneous nerve typically descend?
- Between biceps brachii and brachialis
- Between pronator teres and flexor carpi radialis
- Between triceps brachii and the humerus
- Between the radius and ulna
Q4. The proximal attachment of coracobrachialis is commonly described as a conjoint origin with which structure?
- Pectoralis minor
- Long head of triceps brachii
- Short head of biceps brachii
- Long head of biceps brachii
Q5. Which artery is an important source of blood supply to the coracobrachialis?
- Posterior interosseous artery
- Dorsal scapular artery only
- Ulnar recurrent artery
- Brachial artery
Q6. Why does the coracobrachialis not directly produce movement at the elbow?
- It does not cross the elbow joint
- It has no attachment to the humerus
- It terminates at the scapular spine
- It is supplied by a sensory nerve only
Q7. Which muscle lies lateral to the coracobrachialis in much of the proximal arm?
- Triceps brachii
- Anconeus
- Pronator quadratus
- Biceps brachii
Q8. Which movement combination best represents the principal actions of coracobrachialis?
- Elbow flexion and forearm supination
- Shoulder flexion and adduction
- Shoulder extension and abduction
- Elbow extension and forearm pronation
Q9. How can coracobrachialis contribute to stability of the glenohumeral joint?
- By helping resist displacement of the humeral head during arm movement
- By locking the elbow in extension
- By forming the glenoid labrum
- By attaching directly to the clavicle
Q10. Which landmark is most useful for identifying the proximal attachment of coracobrachialis?
- Lateral epicondyle of the humerus
- Greater tubercle of the humerus
- Infraglenoid tubercle
- Tip of the coracoid process