Oogenesis
Primordial germ cells reach the ovary in 5th week
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All primordial germ cells get converted to oogonium by 3rd month
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All oogonia get converted to primary oocyte by 5th – 7th month
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Completes only prophase
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Go to resting phase ( Diplotene phase ) [ remain in resting phase until puberty ]
After puberty the primary oocyte
↓ complete meiosis 1
Secondery oocyte + 1st polar body (formed due to unequal division of the cytoplasm) [polar body : cell without cytoplasm]
↓ meiosis 2
completes prophase and metaphase (metaphase arrest for 24 hours)
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| Sperm+ | Sperm- |
|---|---|
| Secondary oocyte completes meiosis 2 and it forms ovum and 2nd polar body. | Corpus luteum persists for 14 days and shrinks and forms whit scar called as corpus albicans. |
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