Intermediate Posterior Compartment of the Arm Quiz

Q1. Where does the long head of triceps brachii originate?

• Supraglenoid tubercle of the scapula
• Infraglenoid tubercle of the scapula
• Acromion
• Coracoid process

Q2. Where does the lateral head of triceps brachii principally originate?

• Infraglenoid tubercle
• Medial epicondyle only
• Posterior humerus inferior to the radial groove
• Posterior humerus superior to the radial groove

Q3. Where does the medial head of triceps brachii principally originate?

• Posterior humerus superior to the radial groove
• Posterior humerus inferior to the radial groove
• Coracoid process
• Supraglenoid tubercle

Q4. Which triceps head crosses the glenohumeral joint?

• Long head
• Lateral head
• All three heads equally
• Medial head

Q5. What additional actions can the long head of triceps brachii perform at the shoulder?

• Extension and adduction of the arm
• Pronation and wrist flexion
• Abduction and lateral rotation only
• Finger extension and thumb abduction

Q6. Which nerve travels in the radial groove of the humerus?

• Ulnar nerve
• Radial nerve
• Median nerve
• Musculocutaneous nerve

Q7. Which artery accompanies the radial nerve in the radial groove?

• Superior ulnar collateral artery
• Radial recurrent artery
• Anterior interosseous artery
• Deep brachial artery

Q8. Which intermuscular septum does the radial nerve pierce to leave the posterior compartment?

• Bicipital aponeurosis
• Medial intermuscular septum
• Interosseous membrane
• Lateral intermuscular septum

Q9. From which cord of the brachial plexus does the radial nerve arise?

• Posterior cord
• Lateral and medial cords together
• Lateral cord
• Medial cord

Q10. Which statement best describes the relationship of the medial head of triceps to the other heads?

• It does not attach to the humerus
• It lies largely deep to the long and lateral heads
• It lies entirely superficial to both other heads
• It is located in the anterior compartment