The innominate |veins| are two short, large trunks extending on each side of the neck. The |veins| are formed by the conjunction of the |internal jugular vein| and the |subclavian vein|. The right innominate vein is about an inch in length extending downward to merge with the |left innominate vein| just below the first |rib| to form the superior vena cave. The |left innominate vein| is slightly larger, about two and a half inches in length, and runs horizontally across the upper front part of the chest.
