Question: where does the vagus nerve enter the abdomen
Answer: Upon leaving the medulla oblongata between the pyramid and the inferior cerebellar peduncle , the vagus nerve extends through the jugular foramen , then passes into the carotid sheath between the internal carotid artery and the internal jugular vein down to the neck , chest , and abdomen , where it contributes to the innervation of the viscera , reaching all the way to the colon .