<prompt> Concerning Brachial plexus, which of the following facts are true:Formed by spinal nerve C5 - T1Most common site of injury is upper trunkIt is surrounded by fascia derived from preveebral fasciaAll  <response>: A, B, C i.e. Formed by spinal nerve C5 - T1, Most common site of injury is upper trunk , Injury may occur during breech delivery, Lower trunk injury results in hand deformity 