L4.8.2.1.2.1: Humerus

• HUMERUS

  ● Largest bone of the upper extremity and defines the human brachium (arm)
• ANTERIOR PARTS OF THE HUMERUS

  • Head
  • Anatomical neck
  • Greater and lesser tubercle
  • Intertubercular sulcus
  • Deltoid tuberosity
  • Medial epicondyle
  • Trochlea and capitulum
  • Radial and coronoid fossa
• Anatomical neck

  • Inferior to the head, slight constriction below it
• Head

  • Rounded structure at the proximal end of the bone
  • Fits in the glenoid cavity of the scapula
• Greater & lesser tubercle

  • Bony projections near the anatomical neck that are sites of muscle attachment
• Intertubercular sulcus

  • Between the greater and lesser tubercle
• Deltoid tuberosity

  • Roughened area on the surface of the shaft
  • Where the large deltoid muscle of the shoulder is attached
• Medial epicondyle

  • Found at the distal end; located beside the two important fossa
• Trochlea & capitulum

  • Both distal end processes of the bone that articulates with the forearm
• Radial & coronoid fossa

  • Depressions that allow the movement of the ulna so the elbow can be bent and extended
• POSTERIOR PARTS OF THE HUMERUS

  • Head
  • Anatomical neck
  • Medial and lateral epicondyle
  • Radial groove
  • Olecranon fossa
  • Surgical neck
  • Trochlea
  • Deltoid tuberosity
• Radial groove

  • Runs obliquely at the posterior of the shaft of the bone
  • Marks the force of radial nerve along the humerus
• Surgical neck

  • Said to be the most frequently fractured part of the humerus
• 1. greater tubercle
  2. lesser tubercle
  3. deltoid tuberosity
  4. radial fossa
  5. coronoid fossa
  6. capitulum
  7. head of humerus
  8. anatomical neck
  9. intertubercular sulcus
  10. medial epicondyle
  11. trochlea
  12. surgical neck
  13. radial groove
  14. deltoid tube|rosity
  15. olecranon fossa
  16. lateral epicondyle

  A) 1-6

  B) 7

  C) 8-9

  D) 10

  E) 11

  F) 12

  G) 13-14

  H) 15-16