In this report is described anomally of arteria ulnaris topography. By anatomical dissection of cadaver of a male new-born, we noticed the ulnar artery, on the right arm, layed superficially, under of fascia antebrachi. The ulnar artery was the branch of brachial artery, and it run directly from the brachial artery, in the level of interepicondilar line, to the madial part of the distal end of antebrachium, and it attached by ulnar nerve before they entered Guyon's canal.