The vena brachialis is a vein located in the upper arm region and is an essential part of the circulatory system, responsible for returning blood from the arm back to the heart. Synonyms for the vena brachialis include the brachial vein and arm vein. This vein can sometimes be mistaken for the brachial artery, which is responsible for carrying oxygenated blood to the arm. The vena brachialis serves an essential role in maintaining proper circulation throughout the arm, and it is crucial that medical professionals understand its function and location in the body. Some medical conditions may affect the vena brachialis, like thrombosis or inflammation, resulting in adverse effects on the arm's circulation.