Superficial ulnar artery: embryology, case report, and clinical significance in reconstructive microsurgery.

In this paper the authors describe and illustrate a rare anatomic variation of the ulnar artery, a superficial ulnar artery. The possible embryologic events responsible for this variation are discussed. In addition, they describe the surgical considerations that should be kept in mind when this abnormality is encountered in the clinical setting of free-tissue transfer and vascularized nerve grafting.