Artery Collateral Middle

The middle collateral artery (a. collateralis media, pna, bna, jna) is the middle branch of the ulnar artery. It originates in the middle third of the shoulder and goes to the shoulder muscles.

The middle collateral artery supplies blood to the muscles of the shoulder - the biceps brachii, brachialis and elbow muscles. It also gives off branches to the skin of the shoulder and surrounding tissues.

This artery is important in the collateral circulation of the shoulder. When the brachial artery is blocked, it can partially compensate for the blood supply to the shoulder through anastomoses with the branches of the radial artery.

Thus, the middle collateral artery supplies blood to the muscles and skin of the shoulder, and also participates in collateral blood flow during occlusion of the brachial artery.

Collateral artery, or a. collateralis, is a large branch of the anterior interventricular branch of the left coronary artery. It originates from the anterior portion of the interventricular foramen and continues posteriorly and downward toward the interventricular region. In some cases, artery collateralis may also