Cytopathology is a branch of pathology, studying pathological changes in cells as the basic structural unit of the organism. Changes to the constituent elements of the cytoplasm (the mitochondria, Golgi apparatus, cell membrane and others) and kernel identify special methods, among which the special place is occupied electron microscopy (see). One of the branches of cytopathology is cytopathogene - investigation of violations of chemistry cells methods histo - and cytochemistry.