The first recording of embryonic studies in the pre-Christian era of the Greek world was Hippocrates and was followed by the world Aristotle with the idea that the fetus is a mass of blood clotted. In the fifteenth century, the world of Leonard was able to draw a uterus with a fetus. In the seventeenth century, Graf described the ovary. In the 18th century, Wolf developed a theory of embryonic formation that the embryo members formed in stages. In the 19th century, von Pier described the fertilized egg and the stages of the plastula and the gastro- . In the late 20th century, the foundations of modern embryology were developed. It is a modern science that has made rapid progress to achieve remarkable results in medicine and textiles.
