1. Primary oocytes will undergo oogenesis in which they enter meiosis.2. Primary oocytes have been created in late fetal life.3. Primordial follicles are immature primary oocytes surrounded by a single layer of granulosa cells. 4. Once the primary oocytes stop dividing the cells enter a prolonged resting phase. 5. Eventually, the oogonia will either degenerate or further differentiate into primary oocytes through asymmetric division. 6. After beginning the meiotic process, the oogonia ( now called primary oocytes ) can no longer replicate. 7. Human primary oocytes are present at an intermediate stage of meiosis, termed prophase I ( see Oogenesis ). 8. Until the preovulatory stage, the follicle contains a primary oocyte that is arrested in prophase of metaphase II. 9. Human primary oocytes are present at an intermediate stage of meiosis, that is prophase I ( see Oogenesis ). 10. "P . triqueter " males release spermatogonia or primary spermatocytes into the sea and females release primary oocytes .
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