You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Nerve commonly injured in classical radical neck neck dissection is? and explain in detail?
The main disability that follows the Classical Radical Neck Dissection is weakness and drooping of the shoulder due to paralysis of the trapezius muscle as a consequence of excision of the accessory Nerve. Reference : Bailey & Love, 27th Edition, page no = 758.