Origin Of Germ Layers
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| Step 1 | Cleavage, yeilding solid ball of cells (Morula)
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| Step 2 | Division continues, blastocoel develops, hollow ball of cells now called blastula.
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| Step 3 | Gastrulation. Germ layers form as hollow blastula transfroms into 3-layered gastrula
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| Step 4 | Surface cells move inwards through blastopore, which forms in the embryo
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| Step 5 | Cells continue to involute, and occulde blastocoel while establishing another cavity called the archenteron (primitive gut)
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| Step 6 | Opening of archenteron is closed by a yolk plug.
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| Step 7 | Cells that move inwards are replaced by other cells that spread out on the surface (epiboly).
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| Step 8 | Blastopore closes to encompass yolk, and marks position of future anus.
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| Step 9 | This results in a 3-layered structure around a cavity.
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