Radial Nerve

Humerus:
Spiral groove

Elbow:
Anterolateral aspect of elbow between brachioradialis and brachialis
At the proximal margin of supinator, superficial to radiocapetular joint, divides into superficial and deep (posterior interosseuous N) branches

Motor supply:
Triceps, anconeus, brachioradialis, ECRL, ECRB