Median nerve anatomy helps inform us about its function. Movements are caused by the median nerve. Nerves send electrical pulses that stimulate muscles to contract or flex, causing movement.

Radial tunnel syndrome is a medical condition that causes weakness and pain in the forearm or hand, due to a pinched radial nerve. This nerve starts in the armpit and runs down to the hand.

Anatomy of the Hand. The distribution of the ulnar nerve is shown in yellow, ... To block the radial nerve, identify the radial artery and radial styloid through palpation.