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secondary oocyte, an oocyte in the period between the first and second maturation division. It is derived from a primary oocyte shortly before ovulation by a division that splits off the first polar body. If fertilized, it divides into an ootid and the second polar body.Otherwise, it perishes.In humans, it is a round cell about 0.1 mm in diameter and consists of protoplasm that contains some yolk enclosed by a thin cell wall, the vitelline membrane. It is surrounded by the zona pellucida and corona radiata.f fertilized, it divides into an ootid and the second polar body. Otherwise, it perishes. In humans, it is a round cell about 0.1 mm in diameter and consists of protoplasm that contains some yolk enclosed by a thin cell wall, the vitelline membrane. It is surrounded by the zona pellucida and corona radiata.
Primary oocyte begins to grow â. Theca follicli (connective tissue) develop â. Combined with the granulosa cells the theca cells produce estrogen. â. Zona pellucida forms around the primary oocyte. â. Clear liquid fills the follicle creating a cavity called the antrum. bulges from the ovary. The primary oocyte finishes meiosis I (that was started as a fetus) and it becomes the secondary oocyte with a polar body. 2).