Abstract
Current concepts in the steps of upper limb development and the way the limb is patterned along its 3 spatial axes are reviewed. Finally, the embryogenesis of various congenital hand anomalies is delineated with an emphasis on the pathogenetic basis for each anomaly. (J Hand Surg 2013;38A:1835-1844. Copyright (C) 2013 by the American Society for Surgery of the Hand. All rights reserved.)