Which cranial nerve do baroreceptors in the aortic arch communicate with to relay information to the medulla?

Baroreceptors in the aortic arch are primarily responsible for detecting changes in blood pressure. These receptors send signals to the central nervous system about blood pressure status, playing a crucial role in the autonomic regulation of heart rate and vascular tone.

The vagus nerve, also known as cranial nerve X, innervates the aortic arch and is essential for relaying information from the baroreceptors located there to the medulla oblongata. The medulla is responsible for autonomic functions, and it integrates signals received from the baroreceptors to maintain homeostasis in blood pressure.

In contrast, while the glossopharyngeal nerve (cranial nerve IX) carries sensory information from the carotid sinus, it is not the main nerve communicating from the aortic arch. The facial and accessory nerves are involved in different functions unrelated to baroreceptor signaling. Thus, the vagus nerve's role in communicating baroreceptor information to the medulla makes it the correct answer.