Fig. 6-22. The right radius. In the lateral view, note the shallow groove immediately to the right of the styloid process; this is occupied by the tendons of the abductor pollicis longus and extensor pollicis brevis. In the posterior view, note that the dorsal tubercle is grooved; the groove is occupied by the tendon of the extensor pollicis longus. The tendons of the extensor carpi radialis longus and brevis lie to the radial side of the tubercle; the tendons of the extensor indicis and extensor digitorum lie to the ulnar side.Click for high resolution image.