The ulnar veins are located in the forearm, next to the ulna bone. These blood vessels seek to drain deoxygenated blood from the forarm. Collectively, this blood then moves up the forearm. Then, these vessels join with the radial veins, forming the brachial veins. This is all part of the venal circulatory system. Eventually, all deoxygenated blood must move back to the heart and the pulmonary artery, where blood transits back to the lungs so that it can be reoxygenated. Venal vessels are not the same as arteries, and as such, the ulnar veins should not be collectively misconstrued as the ulnar artery. The arterial circulatory system moves oxygenated blood away from the heart. As such, the ulnar artery takes blood from brachial artery and moves it down the forearm and into the hands. The ulnar artery and veins are part of a common anatomical relationship called venae comitantes, and while opposites, the two types of blood vessels are meant to compliment each other's function.
Written and medically reviewed by the Healthline Editorial Team
In Depth: Ulnar veins