Secondary oocyte

Secondary oocytes are released at ovulation. The second meiotic division resumes after penetration by sperm.
In humans, secondary oocytes are fertilized. Eggs are produced only after fertilization of a secondary oocyte.
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secondary oocyte
A haploid cell whose chromosome number was reduced when a diploid primary oocyte underwent meiosis. A secondary oocyte will undergo a second round of meiosis to produce a haploid ovum and the haploid second polar body.
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One sperm fuses with receptors on the surface of the secondary oocyte, triggering a series of chemical changes in the outer oocyte membrane that prevent any other sperm from entering the oocyte.
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Completion of meiosis II converts the secondary oocyte into a fertilized egg or zygote (and also a second polar body).
As in the diagram for spermatogenesis, the behavior of the chromosomes is greatly simplified.
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oocyte Stage in formation of ovum, just preceding first meiotic division (primary oocyte) or just following first meiotic division (secondary oocyte).
ooecium Brood pouch; compartment for developing embryos in ectoprocts.
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During oogenesis, the immature egg cell in which the first meiotic division begins, leading to the production of the first polar body and the secondary oocyte.
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