Ovaries have Graafian follicles, which store immature eggs {oogonium}.
Oogonia develop {oogenesis} to make oocytes.
Oogonia develop to make immature eggs {oocyte} {primary oocyte}.
If follicle matures, egg divides into main cell {secondary oocyte} and cell {polar body} with little cytoplasm.
One secondary oocyte divides into one large cell {ootid} and one polar body.
Polar bodies disintegrate, and ootid matures into egg cell {ovum} {ova}, with much yolk. Follicle cells kill bad eggs.
Cells {corona radiata} cover eggs. Hyaluronic acid carbohydrate holds cells together.
After sperm enters egg, membrane {fertilization membrane} forms, to block other sperm.
4-Zoology-Organ-Reproduction-Female
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Date Modified: 2022.0225