![This is blank.](https://digitalhistology.org/wp-content/themes/histology-unified/imgs/trans.png)
Rough endoplasmic reticulum
This high magnification electron micrograph shows ribosomes aligned along the cytoplasmic surface of the membranes of the endoplasmic reticulum. Ribosomes, approximately 25 nanometers in diameter, synthesize proteins, which are either inserted into the RER membrane or are translocated into the lumen of the cistern. 65,000x
![RER cistern <p>This high magnification electron micrograph shows ribosomes aligned along the cytoplasmic surface of the membranes of the endoplasmic reticulum. Ribosomes, approximately 25 nanometers in diameter, synthesize proteins, which are either inserted into the RER membrane or are translocated into the lumen of the cistern. 65,000x</p>](https://digitalhistology.org/wp-content/uploads/2017/05/C.S.ER-6-1-ping.png)
RER cistern
This high magnification electron micrograph shows ribosomes aligned along the cytoplasmic surface of the membranes of the endoplasmic reticulum. Ribosomes, approximately 25 nanometers in diameter, synthesize proteins, which are either inserted into the RER membrane or are translocated into the lumen of the cistern. 65,000x
![- Cistern lumen <p>This high magnification electron micrograph shows ribosomes aligned along the cytoplasmic surface of the membranes of the endoplasmic reticulum. Ribosomes, approximately 25 nanometers in diameter, synthesize proteins, which are either inserted into the RER membrane or are translocated into the lumen of the cistern. 65,000x</p>](https://digitalhistology.org/wp-content/uploads/2017/05/C.S.ER-6-2-ping.png)
- Cistern lumen
This high magnification electron micrograph shows ribosomes aligned along the cytoplasmic surface of the membranes of the endoplasmic reticulum. Ribosomes, approximately 25 nanometers in diameter, synthesize proteins, which are either inserted into the RER membrane or are translocated into the lumen of the cistern. 65,000x
![- Ribosomes <p>This high magnification electron micrograph shows ribosomes aligned along the cytoplasmic surface of the membranes of the endoplasmic reticulum. Ribosomes, approximately 25 nanometers in diameter, synthesize proteins, which are either inserted into the RER membrane or are translocated into the lumen of the cistern. 65,000x</p>](https://digitalhistology.org/wp-content/uploads/2017/05/C.S.ER-6-3-ping.png)
- Ribosomes
This high magnification electron micrograph shows ribosomes aligned along the cytoplasmic surface of the membranes of the endoplasmic reticulum. Ribosomes, approximately 25 nanometers in diameter, synthesize proteins, which are either inserted into the RER membrane or are translocated into the lumen of the cistern. 65,000x
![Cytoplasm <p>This high magnification electron micrograph shows ribosomes aligned along the cytoplasmic surface of the membranes of the endoplasmic reticulum. Ribosomes, approximately 25 nanometers in diameter, synthesize proteins, which are either inserted into the RER membrane or are translocated into the lumen of the cistern. 65,000x</p>](https://digitalhistology.org/wp-content/uploads/2022/05/C.S.ER-6-cyto-ping.png)
Cytoplasm
This high magnification electron micrograph shows ribosomes aligned along the cytoplasmic surface of the membranes of the endoplasmic reticulum. Ribosomes, approximately 25 nanometers in diameter, synthesize proteins, which are either inserted into the RER membrane or are translocated into the lumen of the cistern. 65,000x