This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': "Muscles paralysed in Erb's paralys are all except? \nSelect and explain. \nA. Biceps, B. Triceps, C. Brachioradialis, D. Brachiali", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Triceps Erb's paralysis One region of upper trunk (C5, C6) of the brachial plexus is called Erb's point where six nerves meet. o Injury at this point results in Erb's paralysis The injury is due to undue separation of the head from the shoulder, which may be seen in : ? Bih injury Fall on the shoulder During Anesthesia Clinical features of Erb's palsy Muscles paralysed : Mainly biceps brachii, deltoid, branchialis and brachioradialis. Paly supraspinatus, infraspinatus and supinator. Deformity (position of the limb) Arm : Hanges by the side; it is adducted and medially rotated Forearm : Extended and pronated The deformity is known as 'policeman's tip hand' or 'poer's tip hand'. Disability : The following movements are lost. Abduction and lateral rotation of the arm (shoulder). Flexion and supination of the forearm. Biceps and supinator jerks are lost. Sensations are lost over a small area over the lower pa of the deltoid", 'role': 'assistant'}]