<prompt> A 19 year old boy fell from the motorbike on his shoulder. The doctor diagnosed him as a case of Erbs paralysis. All of the following signs and symptoms will be observed in this boy, EXCEPT:Loss of abduction at shoulder jointLoss of lateral rotationLoss of pronation at radioulnar jointLoss of flexion at elbow joint.  <response>: Due to Erbs paralysis there is damage of biceps brachii and supinator due to which there is loss of pronation of forearm. It is associated with loss of abduction at shoulder joint, loss of lateral rotation and loss of flexion at elbow joint and is not associated with loss of pronation at radioulnar joint.Erbs paralysis occur from damage at the Erbs point which is the meeting point of 6 nerves such as ventral rami of C5 and C6, suprascapular and nerve to subclavius of upper trunk and two divisions of upper trunk. Muscles paralysed are supraspinatus, deltoid, teres minor, infraspinatus, biceps brachii, brachialis, brachioradialis and supinator. PositionParalysis ofOveraction of Adduction of armSupraspinatus and deltoidAdductors of the shoulderMedial rotation of the armTeres minor and infraspinatusMedial rotators of the shoulderExtension of forearmBiceps brachii, brachialis and brachioradialisExtensors of elbowPronation of forearmBiceps brachii and supinatorPronators of forearmRef: Clinical Anatomy for Students: Problem Solving Approach By Neeta V. Kulkarni page 20. 