The nerves of the cervical plexus and brachial plexus can be affected. One complication of shoulder dystocia is damage to the upper brachial plexus nerves. Both muscles are innervated by the dorsal scapular nerve, a branch of the brachial plexus. The radial artery arises from the bifurcation of the brachial artery in the antecubital fossa. Some brachial plexus injuries may heal without treatment. These three nerves branch off the posterior cord of the brachial plexus. It originates from the lateral cord of the brachial plexus of nerves. Central pulses include the carotid, femoral, and brachial pulses. Weakness of the shoulder girdle can lead to traction injury of the brachial plexus. The site and type of brachial plexus injury determine the prognosis. The rate of brachial plexus injury has been increasing. The biceps head is lateral to the brachial artery. It comes from the upper trunk of the brachial plexus. Injury to the brachial plexus can happen in numerous environments. This is very low compared to the other identified brachial plexus injuries.