The pronator teres and extensor indicis proprius muscles are key muscles to remember to assist in this. Because there are no muscles available for EMG that originate from the middle and lower trunks, these two muscles serve as substitutes since they cross to a different cord through a division which all originate at the level of the trunks. It is also helpful to draw the plexus and fill in normal and abnormal muscles for each case of suspected plexopathy. In adults, gunshot wound plexopathies often are left unrepaired to determine if recovery will occur spontaneously, since performing surgery in such cases has little benefit. Reanastomosis of nerve tissue resulting from stab wounds has met with greater success.
Surgeons wisely wait to observe the recovery before performing further exploration and repair.
Physical Trauma to Peripheral Nerves.