![This is blank.](https://digitalhistology.org/wp-content/themes/histology-unified/imgs/trans.png)
Nuclear pores
The nuclear envelope contains openings called nuclear pores, which consist of a complex of proteins encircling an opening. Nuclear pores regulate the bi-directional transit of materials between the cytoplasm and nucleus. In this image, six pores are visible and are marked by sites where the perinuclear space is obscured and the heterochromatin is interrupted. 38,000x
![Nuclear pores <p>The nuclear envelope contains openings called nuclear pores, which consist of a complex of proteins encircling an opening. Nuclear pores regulate the bi-directional transit of materials between the cytoplasm and nucleus. In this image, six pores are visible and are marked by sites where the perinuclear space is obscured and the heterochromatin is interrupted. 38,000x</p>](https://digitalhistology.org/wp-content/uploads/2019/05/C.S.N-14-1A-ping.png)
Nuclear pores
The nuclear envelope contains openings called nuclear pores, which consist of a complex of proteins encircling an opening. Nuclear pores regulate the bi-directional transit of materials between the cytoplasm and nucleus. In this image, six pores are visible and are marked by sites where the perinuclear space is obscured and the heterochromatin is interrupted. 38,000x
![Inner nuclear membrane <p>The nuclear envelope contains openings called nuclear pores, which consist of a complex of proteins encircling an opening. Nuclear pores regulate the bi-directional transit of materials between the cytoplasm and nucleus. In this image, six pores are visible and are marked by sites where the perinuclear space is obscured and the heterochromatin is interrupted. 38,000x</p>](https://digitalhistology.org/wp-content/uploads/2017/05/C.S.N-14-2-ping.png)
Inner nuclear membrane
The nuclear envelope contains openings called nuclear pores, which consist of a complex of proteins encircling an opening. Nuclear pores regulate the bi-directional transit of materials between the cytoplasm and nucleus. In this image, six pores are visible and are marked by sites where the perinuclear space is obscured and the heterochromatin is interrupted. 38,000x
![Outer nuclear membrane <p>The nuclear envelope contains openings called nuclear pores, which consist of a complex of proteins encircling an opening. Nuclear pores regulate the bi-directional transit of materials between the cytoplasm and nucleus. In this image, six pores are visible and are marked by sites where the perinuclear space is obscured and the heterochromatin is interrupted. 38,000x</p>](https://digitalhistology.org/wp-content/uploads/2017/05/C.S.N-14-3-ping.png)
Outer nuclear membrane
The nuclear envelope contains openings called nuclear pores, which consist of a complex of proteins encircling an opening. Nuclear pores regulate the bi-directional transit of materials between the cytoplasm and nucleus. In this image, six pores are visible and are marked by sites where the perinuclear space is obscured and the heterochromatin is interrupted. 38,000x
![Perinuclear space <p>The nuclear envelope contains openings called nuclear pores, which consist of a complex of proteins encircling an opening. Nuclear pores regulate the bi-directional transit of materials between the cytoplasm and nucleus. In this image, six pores are visible and are marked by sites where the perinuclear space is obscured and the heterochromatin is interrupted. 38,000x</p>](https://digitalhistology.org/wp-content/uploads/2019/05/C.S.N-14-4A-ping.png)
Perinuclear space
The nuclear envelope contains openings called nuclear pores, which consist of a complex of proteins encircling an opening. Nuclear pores regulate the bi-directional transit of materials between the cytoplasm and nucleus. In this image, six pores are visible and are marked by sites where the perinuclear space is obscured and the heterochromatin is interrupted. 38,000x
![RER <p>The nuclear envelope contains openings called nuclear pores, which consist of a complex of proteins encircling an opening. Nuclear pores regulate the bi-directional transit of materials between the cytoplasm and nucleus. In this image, six pores are visible and are marked by sites where the perinuclear space is obscured and the heterochromatin is interrupted. 38,000x</p>](https://digitalhistology.org/wp-content/uploads/2017/05/C.S.N-14-5-ping.png)
RER
The nuclear envelope contains openings called nuclear pores, which consist of a complex of proteins encircling an opening. Nuclear pores regulate the bi-directional transit of materials between the cytoplasm and nucleus. In this image, six pores are visible and are marked by sites where the perinuclear space is obscured and the heterochromatin is interrupted. 38,000x
![Mitochondria <p>The nuclear envelope contains openings called nuclear pores, which consist of a complex of proteins encircling an opening. Nuclear pores regulate the bi-directional transit of materials between the cytoplasm and nucleus. In this image, six pores are visible and are marked by sites where the perinuclear space is obscured and the heterochromatin is interrupted. 38,000x</p>](https://digitalhistology.org/wp-content/uploads/2017/05/C.S.N-14-6-ping.png)
Mitochondria
The nuclear envelope contains openings called nuclear pores, which consist of a complex of proteins encircling an opening. Nuclear pores regulate the bi-directional transit of materials between the cytoplasm and nucleus. In this image, six pores are visible and are marked by sites where the perinuclear space is obscured and the heterochromatin is interrupted. 38,000x
![Illustration <p>The nuclear envelope contains openings called nuclear pores, which consist of a complex of proteins encircling an opening. Nuclear pores regulate the bi-directional transit of materials between the cytoplasm and nucleus. In this image, six pores are visible and are marked by sites where the perinuclear space is obscured and the heterochromatin is interrupted. 38,000x</p>](https://digitalhistology.org/wp-content/uploads/2017/05/C.S.N-14-7-ping.png)
Illustration
The nuclear envelope contains openings called nuclear pores, which consist of a complex of proteins encircling an opening. Nuclear pores regulate the bi-directional transit of materials between the cytoplasm and nucleus. In this image, six pores are visible and are marked by sites where the perinuclear space is obscured and the heterochromatin is interrupted. 38,000x