Twenty fresh cadaver dissections examining the medial arm flap were completed. Blood supply to the medial arm skin was from the branches off the superior ulnar collateral artery (65%), direct cutaneous branches from the brachial artery (20%), or both (15%). Injection studies were completed demonstrating the extent of the medial arm flap. Four clinical cases were completed. The results in this article are different from some previous studies because they show that the superior ulnar collateral system is always present, the superior ulnar collateral vessels never directly supply the medial arm skin, and the medial arm skin may have a direct cutaneous supply from the brachial artery.
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