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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.
sperm bind to this structure that surrounds the oocyte cell membrane. When the sperm that enters the 2ndary oocyte leaves its middle section and tail outside, lysosome-like vesicles beneath the oocyte cell membrane release enzymes that harden this structure, reducing the chance that other sperm cells will penetrate. hollow ball of cells formed after division of the morula. This drops into one of the tubules in the endometrium. Its inner cell mass cell gives rise to the embryo proper (the body of the developing offspring).