Peripheral Nerve Anatomy


The median nerve is one of the five main nerves that originate from the brachial plexus, which is a network of nerve fibers that proceeds through the neck, the armpit, and into the arm. The median nerve is travels from the brachial plexus down the forearm, originating from the cervical levels of C5-6 and C8-T1. The median nerve is the only nerve that passes through the carpal tunnel.


The ulnar nerve is a nerve which runs near the ulna bone of the forearm. The ulnar nerve is the largest unprotected nerve in the human body, making injury common. This nerve is directly connected to the little finger and the ring finger and supplies the sensory function to these fingers. The ulnar nerve originates from C8-T1 and descends on the back middle portion of the forearm. The ulnar nerve passes through the cubital tunnel of the elbow.