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Plate 8: Bones of the Arm

Fig. 1. a, the humerus; the head, b, is a portion of a sphere, and exhibits an example of the ball and socket, or universal joint; c, the hinge-joint, instanced in the elbow; d, the radius; e, the ulna. The radius belongs more peculiarly to the wrist, being the bone which supports the hand, and which turns with it in all its revolving motions. The ulna principally belongs to the elbow-joint, for by it we perform all the actions of bending or extending the arm.

Fig. 2. a, the humerus: b, shows the connexion of the radius, with c, the ulna, at the elbow. The mode of articulation at the wrist is seen, Fig. 1.