What do the axillary arteries become in the upper arm?

The axillary arteries transition into the brachial arteries as they move into the upper arm. This anatomical change signifies a key point in the vascular system, as the brachial arteries are the primary blood supply to the arm and forearm. After transitioning from the axillary region, the brachial artery continues down the arm and eventually bifurcates into the radial and ulnar arteries near the elbow, facilitating blood flow to the forearm and hand.

The axillary artery is responsible for supplying blood to upper limb structures, including the shoulder and upper chest areas. Once it passes the teres major muscle, it becomes the brachial artery, indicating its role in delivering oxygenated blood further along the arm. Understanding this transition is essential for professionals in vascular and interventional radiology, as it pertains to procedures and treatments involving arm circulation.