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 Submandibular nodes are classified as and explain in detail?
Level 1A =Submental Node Level1B = Submandibular nodes, lie between the anterior and posterior bellies of digastric muscle and the lower border of mandible. Level II=Upper Jugular Nodes Level III=Middle Jugular Nodes Ref: Textbook of ENT; Dhingra; 6th edition; Page no: 387; Table 76 ref img