structures outside the nucleus of a cell that contain RNA. This is where protein synthesis actually takes place
plasma = a thing formed + reticulum = a small net (-work), dimutive of L. rete, q.v.; a connecting network of membranous channels and sacs in cytoplasm; of two types: rough e.r. with many ribosomes on surface, and smooth e.r., without ribosomes; cf. ergastoplasm.
A network of membranous channels in the cytoplasm of a cell that function in intracellular transport, synthesis, storage, packaging, and secretion.