The common interosseous artery is the first ulnar branch to arise and it subdivides into the:
• Anterior interosseous artery: descends with the interosseous branch of the median nerve on the anterior surface of the interosseous membrane. It predominantly supplies the flexor compartment of the forearm.
• Posterior interosseous artery: passes above the upper border of the interosseous membrane to enter the extensor compartment where it runs with the deep branch of the radial nerve supplying the extensor muscles of the forearm, eventually anastomosing with the anterior interosseous artery.
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