Question
Structure of secondary oocyte.
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Answer
- The unfertilized egg released through ovary at the time of ovulation is a secondary oocyte.
- It is rounded, non-motile and haploid, non- cleidoic and microlecithal female gamete.
- The size is approximately 0.1 mm (100 microns).
- It has abundant cytoplasm called ooplasm which contains a large eccentric and prominent nucleus called germinal vesicle.
- Centrioles are absent in secondary oocyte.
- Various coverings seen around the oocyte are (i) vitelline membrane (ii) zona pellucida (iii) Corona radiata.
- The cells are glued together with hyaluronic acid. Between vitelline membrane and zona pellucida, there is perivitelline space which lodges first polar body. This end is called 5 animal pole and the opposite is called vegetal pole.
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