By the time the fertilized egg reaches the uterus it is a hollow ball of cells called a: Morula
- This collection of cells, known as a morula, resembles a little ball by the time it reaches the uterus.
- The morula develops a hollow interior and fills with fluid to produce a blastocyst.
- The blastocyst will cling to the endometrium, the uterus' lining, by the end of this week. The term for this is implantation.
- The zygote, which comes before the blastocyst, is split into the morula, a solid mass with 16–32 blastomeres.
- At the 8-cell stage, a process known as compaction starts, in which the spherical, loosely linked blastomeres take on a flattened polarized cell shape.
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