Development of the Embryo The next stage in development is the embryo, which develops within the amniotic sac, under the lining of the uterus on one side. This stage is characterized by the formation of most internal organs and external body structures. The third stage starts from the beginning of the 13th week till the end of the 22th week, In this stage, the bones start to develop, as well as the circulatory system, the sex of the embryo can be distinguished, and the mother can feel the movement of her fetus due to the strength of the embryo muscles which help in the movement. Stages of IVF Embryo Development. At Arizona Center for Fertility Studies, all embryology laboratory equipment, incubators and ancillary Assisted Reproductive Technology (ART) equipment has back-up electrical power in case of a power outage.
Caroline has been teaching college biology for nearly 15 years. Log in or sign up to add this lesson to a Custom Course. Login or Sign up. Have you ever wondered what makes us male or female? What it embryo development sex stages
that determines our sex before we are even born?