<prompt> Abduction and lateral rotation of shoulder is caused by nerve roots -C1 C2C3 C4C5 C6C8 T1  <response>: Ans. is c i.e., C5 C6 o Abduction and lateral rotation of arm shoulder is caused by C5C6 nerve roots. Therefore, in Erbs palsy C5C6 damage, the arm is adducted and medially rotated. Clinical features of Erbs palsy A Muscles paralysed: Mainly biceps brachii, deltoid, branchialis and brachioradialis. Partly supraspinatus, infraspinatus and supinator. B Deformity position of the limb i Arm : Hangs by the side; it is adducted and medially rotated. ii Forearm : Extended and pronated. The deformity is known as policemans tip hand or porters tip hand. C Disability : The following movements are lost. o Abduction and lateral rotation of the arm shoulder o Flexion and supination of the forearm. o Biceps and supinator jerks are lost. o Sensations are lost over a small area over the lower part of the deltoid. 