Changes

* Primary ovarian cells line hollow cavities with folded walls.

* Primary ovarian cells line hollow cavities with folded walls.

** Oogonia are shed into this cavity, gaining a layer of epithelial cells in the process.

** Oogonia are shed into this cavity, gaining a layer of epithelial cells in the process.

** Become granulosa cells, responsible for yolk formation in the developing egg.

** Become [[The_Ovary_-_Follicles_-_Anatomy_%26_Physiology|granulosa cells]], responsible for yolk formation in the developing egg.

* Ovarian follicle grows.

* Ovarian [[The_Ovary_-_Follicles_-_Anatomy_%26_Physiology|follicle]] grows.

** Hyaline zone forms between the oocyte and the epithelial cells - the zona pellucida.

** Hyaline zone forms between the oocyte and the epithelial cells - the zona pellucida.