The Stages of Development of the Fetus

, MD, Saint Louis University School of Medicine Once per month, an egg is released from an ovary in to a tube that is fallopian. After intercourse, sperm move through the vagina through the cervix and womb into the fallopian pipes, where one semen fertilizes the egg. The fertilized egg (zygote) divides repeatedly since it moves along the fallopian tube to the womb. First, the zygote turns into a ball that is solid of. Then it becomes a hollow ball of cells known as a blastocyst. The blastocyst...

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