The third and the last type, called sarcoplasmic reticulum, is a type of smooth endoplasmic reticulum, which is found in smooth and striated muscles. There are three different types of endoplasmic reticulum – rough, smooth, and sarcoplasmic reticulum. The cross-section diagram given below shows the nucleus and the perinuclear space, the rough endoplasmic reticulum with ribosomes and the smooth endoplasmic reticulum. It is surrounded by cytosol, the liquid part of the cytoplasm, in which the organelles are suspended. Endoplasmic reticulum is arranged in irregular rows, along the circumference of the nucleus. The cisternal space is found in continuation with the perinuclear space – the space between the inner and outer nuclear membranes. The internal space of the organelle, called cisternal space, is interconnected and fluid-filled.
What is Endoplasmic Reticulum?Įndoplasmic reticulum (ER) is a complex network of membranes, that is found in the form tubules, and compressed, sac-like structures called cisternae. However, recent researches suggest that certain types of prokaryotic cells have organelles resembling the endoplasmic reticulum. It is found in eukaryotic plant and animal cells, and not in prokaryotic cells. One of the most vital parts of a cell, the endoplasmic reticulum is responsible for various functions, like protein synthesis.
Did you know that the smooth endoplasmic reticulum has a vital role in the detoxification process, that takes place in the liver? It has been noted that the amount of smooth ER in the liver increases considerably, when there is an overload of toxins in the body.
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