Embryology refers to the branch of biology concerned with the study of prenatal development of gametes, including fertilization and growth of embryos to the fetal stage. It is the foundation for understanding the intimate connection among structures in various organ systems, including muscles and the nervous system. It is integral for comprehending the developmental disorders that can manifest in humans as one of the congenital myopathies. One of the significant aspects of embryology comprises research on stem cells, as it helps to understand how genetic disorders progress and what effect does mutation have. Medical embryology is widely utilized for finding anomalies before birth. It investigates the various mechanisms and phases in which anomalies manifest in newborns. Appearance of abnormalities due to outside contributors results in disruptions. Teratogens are the outside disruptions. Retinoic acid, hyperthermic stress, alcohol and ionizing radiation are examples of common teratogens. The topics covered in this extensive book deal with the recent studies on medical embryology. It presents researches and studies performed by experts across the globe. This book aims to serve as a resource guide for students and experts alike and contribute to the growth of this discipline.