Ulnar Vein: A major vein in the forearm that drains deoxygenated blood from the medial aspect of the hand and forearm, eventually merging with the radial vein.
Brachial Vein: A large vein located in the upper arm that is formed by the union of the radial and ulnar veins, continuing blood's return journey towards the heart.
Deoxygenated Blood: Blood that has delivered its oxygen supply to tissues and organs and now carries carbon dioxide and other waste products back to the heart for purification