. Cunningham's Text-book de l'anatomie. L'anatomie. Le rayon. 215 qui roule dans l'encoche radiale de l'ulna dans les mouvements de pronation et supination. Le caractère de la moitié latérale de la circonférence diffère de la médiale, en sont plus étroits, et l'arrondi du haut en bas. L'collum radii (cou) est la partie resserrée de l'arbre qui soutient la tête, le dépassement de ces derniers étant plus grand vers la face dorsale et latérale. Distance de la nuque, sur la face interne, il y a un relief ovale, les rayons (tuberositas tubérosité radiale). La partie dorsale de thi

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. Cunningham's Text-book of anatomy. Anatomy. THE RADIUS. 215 which rolls within the radial notch of the ulna in the movements of pronation and supination. The character of the lateral half of the circumference differs from the medial, in being narrower, and rounded from above downwards. The collum radii (neck) is the constricted part of the shaft which supports the head, the overhang of the latter being greatest towards the lateral and dorsal side. Distal to the neck, on the medial side, there is an outstanding oval prominence, the tuberositas radii (radial tuberosity). The dorsal part of this is rough for the insertion of the biceps tendon, whilst the volar half is smooth and covered by a bursa which inter- venes between it and the tendon. The shaft (corpus radii), which has a lateral curve and is narrow proximaHy and broad distally, is wedge-shaped on section. The edge of the wedge forms the sharp medial interosseous crest of the bone (crista interossea), whilst its base corresponds to the thick and rounded lateral border over which the volar or anterior surface becomes confluent with the dorsal or posterior surface. The interosseous crest, faint proximally where it lies in line with the dorsal margin of the tuber- osity, becomes sharp and prominent in the middle third of the bone. Distal to this it splits into two faint lines, which lead to either side of the ulnar notch on the distal end of the bone, thus includ- ing between them a narrow triangular area into which the deeper fibres of the pronator quadratus muscle are inserted. To this crest, as well as to the dorsal of the two divergent lines, the interosseous membrane is attached. The lateral surface (once described as the lateral border) is thick and rounded proximally, but becomes thinner and more prominent distally, where it merges with the base of the styloid process. About its middle the anterior and posterior oblique lines become confluent with it, and here, placed between them, is a rough elongated im

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