Endoplasmic Reticulum: Structure, Types and Function of Endoplasmic Reticulum! The electron microscope reveals an extensive membrane system in the cytoplasm called Endoplasmic reticulum (ER). It was first reported by Porter in 1945. This continuous membrane system connects the nuclear membrane on one end and the cell membrane on the other. All cells do not have Endoplasmic reticulum. It is generally [...]
Kinds of Endoplasmic Reticulum: Agranular and Granular Endoplasmic Reticulum! The shape and size of the membrane-bounded ER spaces varies considerably from one cell type to another. Many cells, in fact, possess two distinct forms of ER which are in continuity with one another. On the basis of absence or presence of ribosomes, endoplasmic reticulum (ER) is of two kinds: [...]
Useful notes on the Origin of Endoplasmic Reticulum! At present the manner of origin of the endoplasmic reticulum is not definitely known. The most concrete hypothesis is that the ER is “budded” off from the nuclear envelope (Wischnitzer, 1974). Continuities between the nuclear envelope and ER have often been reported. Barer et al., (1959) found evidence that the nuclear envelope [...]
