<prompt> How to test for the long thoracic nerve?Touch the opposite shoulderShoulder shrugRaise the arm above the headLift an object from the ground  <response>: Long thoracic nerve innervates Serratus anterior. Serratus anterior originates from outer surface of upper 8 ribs and inserts onto inferior angle and medial border of scapula.Actions- It rotates the scapula to help in overhead abduction.- Steady the scapula to carry weight.- Pushing of arm forward in horizontal position.- Helps in forced inspiration. 