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The humerus (bone of the arm).

Humerus

The humerus (bone of the arm).

Anterior view of radius (bone of the arm) of the right side. Labels: 1, cylindrical head; 2, surface for lesser sigmoid cavity of the ulna; 3, neck of the radius; 4, its tubercle, for insertion of biceps muscle; 5, interosseous ridge; 5, interosseous ridge; 6, concavity for lower end of the ulna; 7, lower end of the ulna; 7, carpal surface; 8, styloid process; 9, surface for pronator quadratus muscle.

Radius

Anterior view of radius (bone of the arm) of the right side. Labels: 1, cylindrical head; 2, surface…

Anterior view of the ulna (bone of the arm) of the left side. Labels: 1, olecranon process; 2, greater sigmoid cavity; 5, external surface; 6, ridge for interosseous ligament; 7, small head for the radius; 8, carpal surface.

Ulna

Anterior view of the ulna (bone of the arm) of the left side. Labels: 1, olecranon process; 2, greater…