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Ovary: primary multilaminar follicle
A primary multilaminar follicle is formed when follicular cells, now termed granulosa cells, increase in volume and number, forming a stratified epithelial layer. Zona pellucida, a highly refractile, glycoproteinaceous layer, is prominent around the oocyte at this stage. Stromal cells surrounding the follicle differentiate into the theca (theca folliculi). 400x
![Primary oocyte <p>A primary multilaminar follicle is formed when follicular cells, now termed granulosa cells, increase in volume and number, forming a stratified epithelial layer. Zona pellucida, a highly refractile, glycoproteinaceous layer, is prominent around the oocyte at this stage. Stromal cells surrounding the follicle differentiate into the theca (theca folliculi). 400x</p>](https://digitalhistology.org/wp-content/uploads/2018/03/O.R.F.OV_.07.P01.png)
Primary oocyte
A primary multilaminar follicle is formed when follicular cells, now termed granulosa cells, increase in volume and number, forming a stratified epithelial layer. Zona pellucida, a highly refractile, glycoproteinaceous layer, is prominent around the oocyte at this stage. Stromal cells surrounding the follicle differentiate into the theca (theca folliculi). 400x
![Zona pellucida <p>A primary multilaminar follicle is formed when follicular cells, now termed granulosa cells, increase in volume and number, forming a stratified epithelial layer. Zona pellucida, a highly refractile, glycoproteinaceous layer, is prominent around the oocyte at this stage. Stromal cells surrounding the follicle differentiate into the theca (theca folliculi). 400x</p>](https://digitalhistology.org/wp-content/uploads/2018/03/O.R.F.OV_.07.P04.png)
Zona pellucida
A primary multilaminar follicle is formed when follicular cells, now termed granulosa cells, increase in volume and number, forming a stratified epithelial layer. Zona pellucida, a highly refractile, glycoproteinaceous layer, is prominent around the oocyte at this stage. Stromal cells surrounding the follicle differentiate into the theca (theca folliculi). 400x
![Granulosa cells <p>A primary multilaminar follicle is formed when follicular cells, now termed granulosa cells, increase in volume and number, forming a stratified epithelial layer. Zona pellucida, a highly refractile, glycoproteinaceous layer, is prominent around the oocyte at this stage. Stromal cells surrounding the follicle differentiate into the theca (theca folliculi). 400x</p>](https://digitalhistology.org/wp-content/uploads/2018/03/O.R.F.OV_.07.P02.png)
Granulosa cells
A primary multilaminar follicle is formed when follicular cells, now termed granulosa cells, increase in volume and number, forming a stratified epithelial layer. Zona pellucida, a highly refractile, glycoproteinaceous layer, is prominent around the oocyte at this stage. Stromal cells surrounding the follicle differentiate into the theca (theca folliculi). 400x
![Basement membrane <p>A primary multilaminar follicle is formed when follicular cells, now termed granulosa cells, increase in volume and number, forming a stratified epithelial layer. Zona pellucida, a highly refractile, glycoproteinaceous layer, is prominent around the oocyte at this stage. Stromal cells surrounding the follicle differentiate into the theca (theca folliculi). 400x</p>](https://digitalhistology.org/wp-content/uploads/2018/03/O.R.F.OV_.07.P03.png)
Basement membrane
A primary multilaminar follicle is formed when follicular cells, now termed granulosa cells, increase in volume and number, forming a stratified epithelial layer. Zona pellucida, a highly refractile, glycoproteinaceous layer, is prominent around the oocyte at this stage. Stromal cells surrounding the follicle differentiate into the theca (theca folliculi). 400x
![Theca folliculi <p>A primary multilaminar follicle is formed when follicular cells, now termed granulosa cells, increase in volume and number, forming a stratified epithelial layer. Zona pellucida, a highly refractile, glycoproteinaceous layer, is prominent around the oocyte at this stage. Stromal cells surrounding the follicle differentiate into the theca (theca folliculi). 400x</p>](https://digitalhistology.org/wp-content/uploads/2018/03/O.R.F.OV_.07.P05.png)
Theca folliculi
A primary multilaminar follicle is formed when follicular cells, now termed granulosa cells, increase in volume and number, forming a stratified epithelial layer. Zona pellucida, a highly refractile, glycoproteinaceous layer, is prominent around the oocyte at this stage. Stromal cells surrounding the follicle differentiate into the theca (theca folliculi). 400x