The author has studied the clinical features of split hand, syndactyly, radial and ulnar ray deficiency, and brachydactyly. Many clinical findings make clear that typical split hand is not a result of failure of formation but a result of union of digital rays. If we would try to classify congenital anomalies of the hand on the basis of embryological failure, syndactyly and split hand, and webed and web free brachydactyly are never classified into other categories, just as constriction band syndrome is not divided by the presence of union of the digital rays.
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