Advanced Bones of the Arm and Forearm Quiz

Q1. A fracture of the surgical neck of the humerus places which nerve at particular risk?

• Ulnar nerve
• Median nerve
• Axillary nerve
• Musculocutaneous nerve

Q2. A fracture through the midshaft of the humerus can endanger which nerve because of its relationship to the radial groove?

• Radial nerve
• Axillary nerve
• Median nerve
• Musculocutaneous nerve

Q3. A supracondylar fracture of the humerus can threaten which major artery passing anterior to the distal humerus?

• Axillary artery
• Deep palmar arch
• Posterior circumflex humeral artery
• Brachial artery

Q4. During pronation and supination, which forearm bone primarily rotates around the other?

• The radius rotates around the ulna
• The ulna rotates completely around the radius
• The humerus rotates around the radius
• Neither forearm bone moves during rotation

Q5. Which feature of the proximal radius allows the radial head to rotate within the annular ligament during pronation and supination?

• Articular circumference of the radial head
• Radial styloid process
• Dorsal tubercle
• Radial tuberosity

Q6. Which forearm bone directly articulates with the scaphoid and lunate at the radiocarpal joint?

• Both radius and ulna equally
• Radius
• Ulna
• Humerus

Q7. Why does the distal ulna not directly articulate with the proximal carpal bones?

• An articular disc separates the ulna from the carpal bones
• The ulna ends at the elbow
• The ulna articulates directly with the scaphoid instead
• The radius completely encloses the distal ulna

Q8. Which landmark on the distal radius acts as a pulley for the tendon of extensor pollicis longus?

• Radial tuberosity
• Dorsal tubercle
• Ulnar notch
• Coronoid process

Q9. Which statement correctly describes the relative proximal and distal sizes of the radius and ulna?

• The ulna is larger proximally, while the radius is larger distally
• The ulna is larger than the radius at both ends in every individual
• The radius is larger proximally, while the ulna is larger distally
• Both bones have identical dimensions throughout

Q10. Which description best summarizes the functional organization of the humerus, radius, and ulna?

• The radius forms the arm while the humerus and ulna form the wrist
• The radius and ulna are fused throughout their entire length in normal anatomy
• The humerus forms the arm, while the radius and ulna form a linked forearm system permitting elbow motion and forearm rotation
• All three bones are confined to the forearm and have no role at the elbow