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endoplasmic reticulum is of 2 types- rough and smooth. the rough one has ribosomes. the smooth one does not. the endoplasmic reticulum joins the plasma membrane to the nucleus. it is the skeletal frame work of the cell.
The E.R. consists of tubules, vesicles and cisternae. The cisternae are sac--like and held together by the cytoskeleton. There are two types--rough and smooth E.R. Rough is studded with ribosomes, which are the sites of protein synthesis. The functions of the E.R. include: protein synthesis, production of steroids, storage and production of glycogen and insertion of membrane proteins. Smooth ER contains flattened sacs and tubules, and an interior space or lumen. The ER extends from the cell membrane through the cytoplasm and makes a continuous connection with the nuclear envelope.
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