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Subscribe to the channel: / @maisbiologiaroger The first cytoplasmic organelles were discovered a few centuries after the discovery of the microscope (17th century), more or less in the 19th and 20th centuries. Cytoplasmic organelles are membranous structures (made of the same material that makes up the plasma membrane) inside the cell. Logically, some authors consider some non-membranous structures to be organelles, such as ribosomes or centrioles. In this case, they call them non-membranous organelles. But let's talk about the organelles. The illustration is just a model of a cell, since cells observed under a microscope do not have natural staining for the organelles and, like every model, it contains some truths and several lies. In most sections for observation under a microscope, we only see pieces of cells, so the model would be a 3D reconstruction of something that we cannot see in 3D under a microscope. Finally, in a model we tend to show only what we want, leaving out other things that occur in cells and that are equally important.