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Meiotic division of the secondary oocyte...

Meiotic division of the secondary oocyte is completed:

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The entry of sperm into the cytoplasm of ovum through zona pellucida and the plasma membrane induces the completion of meiotic division of secondary oocyte. The second meiotic division is also unequal results in the formation of a second polar body and a haploid ovum.
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The second meiotic division of the secondary oocyte is induced by

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First meiotic division of oocyte is completed in

Second meiotic division during oogenesis is completed in

The first meiotic division during oogenesis is completed at the stage of