Before We Are Born: Essentials of Embryology and Birth Defects by Keith L. Moore and T.V.N. Persaud: This textbook provides a concise and readable overview of human embryology, focusing on birth defects.
Human Embryology by T.W. Sadler: This free online textbook covers the entire range of human embryology, from conception to birth. It includes high-quality images and diagrams, as well as interactive exercises and quizzes.
Cardiac Embryology By Ra-id Abdulla, MD.Includes animations, notes, pictures, and questions.
www.rchc.rush.edu
The Multi-Dimensional Human Embryo By the University of Michigan.
http://embryo.soad.umich.edu/
Preview the unique changes in human embryos by weeks.
http://www.visembryo.com/baby/index.html
Good navigational online book on embryology written by Dr. Mark Hill
http://217.160.60.64/fb/link7.php?id=151
www.visembryo.com/baby/gloss.html
17 lectures on developmental anatomy with simple illustrations and explanations.