This is a study aid on human embryology for the National Medical Board Exams. It contains 482 questions in standard multiple-choice format in the left column with descriptive answers in the right column. The questions have been taken from exams used at a number of medical schools but are designed to be generally applicable for all state boards. The questions and answers are presented in 14 sections covering general principles, gametogenesis, ovulation to implantation, second and third weeks, placenta and fetal membranes, congenital malformations, muscles and skeleton and skin, body cavities and membranes, craniofacial region, cardiovascular system, respiratory and digestive system, urogenital system, and nervous system and eye and ear.