Final answer:
The left recurrent laryngeal nerve joins the vagus nerve below the aortic arch. The aortic arch is a branch of the aorta.
Step-by-step explanation:
The left recurrent laryngeal nerve joins the vagus nerve below the aortic arch. The aortic arch is a branch of the aorta, which is a major blood vessel that carries oxygenated blood from the heart to the rest of the body. The left recurrent laryngeal nerve innervates the muscles of the larynx and is an important component of the Vagus nerve.