*Oocyte surrounded by a single layer of follicular cuboidal cells.
*Oocyte surrounded by a single layer of follicular cuboidal cells.
* The primary follicle will develop into a secondary follicle.
* The primary follicle will develop into a secondary follicle.
−
** Granulosa cells proliferate into multiple layers and at the end of this the oocyte is fully grown.
+
** Granulosa cells proliferate into multiple layers and at the end of this the [[The_Ovary_-_Oogenesis_-_Anatomy_%26_Physiology|oocyte]] is fully grown.
* Events that characterize this transition are:
* Events that characterize this transition are:
**Thecal layer becomes organised into the Theca Interna and the Theca Externa
**Thecal layer becomes organised into the Theca Interna and the Theca Externa