<prompt> Muscles paralysed in Erbs paralysis are all except -BicepsTricepsBrachioradialisBrachialis  <response>: Erb; s palsy is due to injury to the C5 nerve root rarely the C6 nerve root is injured . Effects of injury - at shoulder : paralysis of deltoid , rhomboids , supra infraspinatus teres minor muscles . This results in loss of shoulder abduction external rotation . - at elbow : biceps brachialis muscles are paralyzed . This results in loss of flexion of elbow joint. - at forearm : supinator muscle paralyzed resulting in loss of supination of forearm - combined effect of injury is an arm hanging loose by the side of the trunk . The shoulder is internally rotated , the elbow is in extension , forearm is pronated wrist is in flexion . This characteristic posture is popularly known as policeman or waiter ;s tip. - apa from this , there may sensory loss on outer aspects of the forearm both in front back. REF:textbook of ohopedics, John Ebenezer,4th edition,pg.no.350 