Final answer:
The aortic body, which contains chemoreceptors and baroreceptors located along the aortic arch, is innervated by the vagus nerve.
Step-by-step explanation:
The aortic body is a small cluster of chemoreceptors and baroreceptors located along the aortic arch. These receptors are vital in the monitoring of blood pH, as well as carbon dioxide and oxygen levels, thereby aiding in the regulation of vascular homeostasis. The aortic body's chemoreceptors and baroreceptors are innervated by the vagus nerve. The baroreceptors from the carotid arteries are innervated by axons in the glossopharyngeal nerve, but those from the aorta have axons in the vagus nerve, which signals the cardiovascular and respiratory centers in the medulla oblongata.