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What is the morula? Definition:
The morula (Latin for mulberry / blackberry) in embryogenesis refers to the cellular stage after fertilization, and before implantation (nidation) into the mucous membrane of the womb. At this time, the morula consists of 8 or 16 cells, which were formed by furrowing in the zygote. Cell division (mitosis) occurs entirely at this stage without cell growth, i. the formerly large initial cell remains preserved in its shape, further protected by the stable cavity of the zona pellucida. Within the cuvette, the individual cells (called blastomeres) divide under constriction with exponential growth (1-2-4-8-16-32-64, etc.).
Incidentally, the name of the morula derives from its similarity to the fruits of the mulberry tree. The arrangement of the blastomeres in the early cell stage resembles the appearance of mulberries or blackberries.
Within the embryogenesis the morula develops into a blastocyst.