What is located closest to the jugular notch?

The jugular notch, located on the superior border of the sternum, is closest to the trachea and the great vessels of the neck, including the aorta and the brachiocephalic veins. It also provides a landmark for the location of the thyroid gland, which lies just inferior and posterior to it. Additionally, the clavicles are nearby, as they articulate with the sternum at the manubrium.