![]() After 28 weeks, the fetus develops and it’s weight increasses until the delivery time.After 12 weeks, the embryo is called fetus which is in the size of strawberry, the hands and feet have developed.After 5 weeks, the embryo is as big an apple seed with hand and foot primordia, and the tail reduces. ![]() After 4 weeks, the embryo floats in a sack containing liquid the heart beats and the brain has developed.After 72 hours from fertilization, the zygote divides into 16 cells which will stick on the uterus in several days later.About 36 hours after fertilization,the fertilized ovum divides once into 2 cells.Fertilization : the fusion of sperm nucleus with ovum nucleus producing fertilized ovum (zyogte).In humans, when embyrogenesis finishes, by the end of the 10th week of gestational age, the precursors of all the major organs of the body have been created. After fertilization the embryogenesis starts.Prenatal development is the process in which a human embyro or fetus gestates during pregnancy, from fertilization until birth.
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