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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. Definition. noun, plural: primary oocytes. The oocyte that arises from the oogonium via the process of oocytogenesis, and gives rise to secondary oocyte and polar body after first meiotic division (meiosis I).Supplement. In humans, the primary oocytes are produced by the process of oocytogenesis that occurs during embryonic stage.At that time each oogonium inside the ovaries of the fetus divides and enters the initial stage of meiosis I to become the primary oocyte.upplement. In humans, the primary oocytes are produced by the process of oocytogenesis that occurs during embryonic stage. At that time each oogonium inside the ovaries of the fetus divides and enters the initial stage of meiosis I to become the primary oocyte.