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 All the following structures are related to carotid sheath except: and explain in detail?
Ans: A (Sympathetic trunk) Ref: Grays Anatomy 40th EdExplanation:Carotid sheathIt is the tubular investment of deep cervical facsiaThe anterior wall of the sheath is formed by pre-traeheal fasciaThe posterior wall is formed by pre-vertebral fasciaAnca cervicalis embedded in the anterior wall of carotid sheathContents:1. Common carotid artery2. Internal carotid artery3. Internal jugular vein4. Vagus nerve