Changes

*The innermost cells of the Granulosa layer become firmly attached to the Zona Pellucida and are known as the Corona Radiata. The outermost Granulosa cells become attached to the basement membrane surrounding them and become known as the Theca Folliculi.

*The innermost cells of the Granulosa layer become firmly attached to the Zona Pellucida and are known as the Corona Radiata. The outermost Granulosa cells become attached to the basement membrane surrounding them and become known as the Theca Folliculi.

*Theca cells become organised into Theca Interna and Theca Externa layers.  

*Theca cells become organised into Theca Interna and Theca Externa layers.  

*The Theca Interna layer cells differentiate into steroidogenic cells produce the Androgen Androsteinedione in response to the Gonadotrophin Luteinising hormone (LH).

*The Theca Interna layer cells differentiate into steroidogenic cells producing the Androgen Androsteinedione in response to the Gonadotrophin Luteinising hormone (LH).

*Theca Cell layer becomes vascularised.

*Theca Cell layer becomes vascularised.