An Oocyte a cell in an ovary which may undergo meiotic division to form an ovum.It is a female gametocyte or germ cell involved in reproduction. In other words, it is an immature ovum, or egg cell. An oocyte is produced in the ovary during female gametogenesis.
Graafian follicle (ovarian follicle) The fluid-filled cavity that surrounds and protects the developing egg cell (oocyte) in the ovary of a mammal. The oocyte is surrounded by granulosa cells, which secrete fluid into the cavity of the follicle. After the release of the ovum the follicle develops into a corpus luteum.