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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.
Difference between an Oocyte and an Embryo. Oocyte. Oocyte is the medical name for a womanâs egg that has not been fertilized. While it is immature, the oocyte remains in a womanâs ovaries. Women are born with all of the oocytes that theyâll ever have. Typically, one oocyte is matured per month, gradually reducing a womanâs egg reserve.