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The humerus (bone of the arm).

Humerus

The humerus (bone of the arm).

Right humerus from before.

Humerus from Before

Right humerus from before.

Right humerus from behind.

Humerus from Behind

Right humerus from behind.

Longitudinal section of humerus showing relation of compact and spongy bone.

Longitudinal Section of Humerus

Longitudinal section of humerus showing relation of compact and spongy bone.

The lower extremity of the right humerus as seen from below.

Humerus, Lower End of

The lower extremity of the right humerus as seen from below.

Section of upper end of humerus, showing the external layer of compact bone surrounding the medullary cavity below and the spongy bone.

Section of Upper End of Humerus

Section of upper end of humerus, showing the external layer of compact bone surrounding the medullary…

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…

Showing the situation of Colle's fracture of the radius, with fracture of the styloid of the ulna. The usual position of a fraction of the scaphoid is also indicated.

Colle's Fraction of the Radius

Showing the situation of Colle's fracture of the radius, with fracture of the styloid of the ulna. The…

Here you see the thigh bone on the left and the arm bone on the right. In both, the shaft is hollow, while the large ends are more dense. In the living bone, bone marrow is found in the hollow area which serves in blood cell production.

Thigh Bone and Arm Bone

Here you see the thigh bone on the left and the arm bone on the right. In both, the shaft is hollow,…

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…

Right ulna, inner aspect.

Inner Aspect of Ulna

Right ulna, inner aspect.

Longitudinal section of ulna.

Longitudinal Section of Ulna

Longitudinal section of ulna.

Right ulna, outer aspect.

Outer Aspect of Ulna

Right ulna, outer aspect.

A, transverse section of the ulna, (bone of the arm), natural size, showing the medullary cavity. B, the more deeply shaded part of A magnified 20 diameters.

Transverse Section of Ulna

A, transverse section of the ulna, (bone of the arm), natural size, showing the medullary cavity. B,…