What is radial neuropathy?

Radial neuropathy: The radial nerve travels across the back of the humerus (upper arm bone) and supplies the brachioradialis muscle and the skin sensation to the back of the hand (among other things). The muscle helps you turn a doorknob clockwise with your right hand (CCW with the left). Radial neuropathy often occurs when we lean our arm over the back of a chair and fall asleep. It also causes a "wrist drop".