. Atlas and text-book of human anatomy. Anatomy -- Atlases. 8B ATLAS AND TEXT-BOOK OF HUMAN ANATOMY. Fig. 117.—The left ulna seen from the outer surface (§). Fig. 118.—The left ulna seen from behind (f). Fig. 119.—The left ulna seen from in front (f). Fig. 121.—The left radius seen from in front (|). Fig. 122.—The left radius seen from the inner side (f). Fig. 123.—The left radius seen from behind (f). Fig. 124.—The upper extremities of the radius and ulna seen from above and somewhat in front (f). Fig. 125.—The lower extremities of the radius and ulna seen from below (|). The inferior extremi
. Atlas and text-book of human anatomy. Anatomy -- Atlases. 8B ATLAS AND TEXT-BOOK OF HUMAN ANATOMY. Fig. 117.—The left ulna seen from the outer surface (§). Fig. 118.—The left ulna seen from behind (f). Fig. 119.—The left ulna seen from in front (f). Fig. 121.—The left radius seen from in front (|). Fig. 122.—The left radius seen from the inner side (f). Fig. 123.—The left radius seen from behind (f). Fig. 124.—The upper extremities of the radius and ulna seen from above and somewhat in front (f). Fig. 125.—The lower extremities of the radius and ulna seen from below (|). The inferior extremity of the bone is rounded and is also called the capitulum. Its radial side presents an articular surface for the radius, the articular circumference (Fig. 119), and a pointed process projecting beyond the capitulum, the styloid process (Figs. 117 to 119). The distal surface of the capitulum and the articular circumference are both covered by cartilage. The center for the diaphysis of the ulna appears in the third fetal month; the centers for the epiphyses'appear after birth, that for the lower epiphysis not being present until the sixth year. The upper epiphysis has two centers for the olecranon (only the apex of which is formed by the epiphysis) and one for the coronoid process. There is also a special center for the styloid process. THE RADIUS. The radius (Figs. 121 to 125) is the outer of the two bones of the forearm, and in contrast to the ulna, it is narrow and thin above and broad and thick below. Its superior extremity (Fig. 124) is formed by the disc-Hke head of the bone, a distinct constriction below the head being designated as the neck,-which portion of the bone is cylindrical. dorsal border. dorsal *T^e volar bordar-^ Fig. 120.—Transverse section through the bones of the forearm, taken at about the middle of their length (schematized). volar border ^ ° , ulna The upper surface of the head exhibits a depressed articular surface
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