L4.8.2.1.2.3: Ulna

• ULNA

  ● One of the two bones that make up the forearm

  ● Forms the elbow joint with the humerus and also articulates with the radius both proximally and distally

  ● Located in the medial forearm when in lateral position
• PARTS OF THE ULNA

  • Olecranon
  • Trochlear notch
  • Coronoid process
  • Ulnar styloid process
• Olecranon

  • Bone at the posterior proximal end of the ulna
  • Articulates with the olecranon fossa of the humerus
• Trochlear notch

  • Separates the olecranon from the coronoid process
• Ulnar styloid process

  • Found at the distal end
• 1. head
  2. neck
  3. radial tuberosity
  4. radius
  5. radial styloid process
  6. trochlear notch
  7. olecranon
  8. coronoid process
  9. proximal radioulnar joint
  10. ulna
  11. interosseous membrane
  12. distal radioulnar joint
  13. ulnar styloid process

  A) 1-4

  B) 5

  C) 6-11

  D) 12

  E) 13