An integrated study regarding the field of human embryology has been elucidated in this book. Human embryology is fast evolving and entering a new phase due to recent modifications and advances in life sciences. Research has led to significant developments in ES and iPS cell technology. This new phase has also generated grueling challenges for scientists all over the world pertaining to technological and ethical issues for future human embryology. However, human embryology is cumbersome in research due to ethics associated with the collection of human materials. This book overviews the development of studies made in this domain from the earliest to the latest advancements, providing knowledge on its principles while tackling various scientific and ethical disputes. We hope that this book will help readers in perceiving human embryo development in a better way.