Primary oocyte

Primary oocyte
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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primary oocyte
A diploid cell formed after a diploid oogonium underwent mitosis. The primary oocyte is arrested in Prophase of Meiosis I. It will complete meiosis to form a haploid primary oocyte and the haploid first polar body.
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The primary oocyte grows much larger and completes the meiosis I, forming a large secondary oocyte and a small polar body that receives little more than one set of chromosomes.
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Each month, approximately 1000 primary oocytes will to mature but most will die.
Ovulation occurs approximately once every 28 days. Females ovulate approximately 400 times during their lifetime.
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Each egg begins oogenesis as a primary oocyte. At birth each female carries a lifetime supply of developing oocytes, each of which is in Prophase I.
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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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A small cell (which eventually disintegrates) that is the by-product of meiosis in female animals. One functional ovum and potentially three polar bodies result from meiosis of each primary oocyte.
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