Arteria Ulnaris is a major blood vessel that runs along the ulna bone in the forearm. It is responsible for supplying blood to the muscles and tissues of the lower arm as well as the hand. There are several synonyms for this term, including the ulnar artery, cubital artery, and the superior ulnar collateral artery. The ulnar artery branches off from the brachial artery in the upper arm and becomes the main source of blood flow to the hand. It is an essential component of the human circulatory system, and any damage or blockage to this artery can result in severe health problems, such as decreased hand mobility or even amputation.