tendon of extensor pollicis longus
Ulnar notch-concavity on medial side of distal end for head of ulna
Radius and ulna connected by
Interosseous membrane
Separates forearm into anterior and posterior compartments
Provides attachment for deep muscles of forearm
Fibers slope downward from radius to ulna
Is most tense when hand is in mid-prone position
Has a gap distal to neck of radius for posterior interosseus vessels
Oblique cord
Crosses gap in interosseus membrane
Attaches neck of radius to ulnar tuberosity
Radioulnar joints-proximal and distal (see below)Elbow Joint
[Plate 425, Elbow: Radiographs]