This book was prepared to present an integrated review of selected topics in Human Embryology. It is designed specifically for students who completed stan- dard courses in the various anatomical disciplines and who wish to review the developmental history of the major organ systems. This book will provide medical students with a highly suitable review for Step 1 of the United States Medical Licensing Exam (USMLE, Step 1). R. E. Coalson J. J. Tomasek Acknowledgments We wish to acknowledge the invaluable assistance provided by our colleagues at the University of Oklahoma Health Sciences Center...