Blastocyst Stage (5 days)
Tim Taylor is a senior writer at Innerbody Research focusing on human anatomy and physiology. Tim earned both his Bachelor of Science degree in Biology and his Master's degree in Teaching from the University of Pittsburgh.
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The blastocyst stage occurs approximately five days after fertilization, after the morula has entered the uterine cavity and has developed a fluid-filled cavity. Once the cavity appears, the morula becomes a hollow ball of cells called a blastocyst. Within the blastocyst, cells in one region group together to form an inner cell mass that eventually becomes the embryo.
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