Aorta
The aorta ( ) is the main artery in the human body, originating from the left ventricle of the heart and extending down to the abdomen, where it splits into two smaller arteries (the common iliac arteries). The aorta distributes oxygenated blood to all parts of the body through the systemic circulation.
Parathyroid artery
The parathyroid artery is the blood vessel that carries blood to each of the parathyroid glands. The parathyroid artery is the single individual artery that provides oxygenated blood supply to the parathyroid glands. While studies have concluded that most subjects' parathyoid glands are supplied by the thyroid arteries, up to 45% have been determined to have a "distinct anastomosing branch between the inferior and the superior thyroid arteries." Some have been shown to contain two are more parathroid arteries.