What is the definition of endoplasmic reticulum?

Medical Definition of endoplasmic reticulum. : a system of interconnected vesicular and lamellar cytoplasmic membranes that functions especially in the transport of materials within the cell and that is studded with ribosomes in some places—see rough endoplasmic reticulum. read more

Endoplasmic reticulum definition, a network of tubular membranes within the cytoplasm of the cell, occurring either with a smooth surface (smooth endoplasmic reticulum) or studded with ribosomes (rough endoplasmic reticulum), involved in the transport of materials. See more. read more

As the development of the oocyte continues and its size increases, basophylia diminishes and more membrane organelles, like the rough endoplasmic reticulum (RER) and the Golgi complex, begin to be apparent. read more