A composite cell cut open to show organization of its main components, as seen via electron microscopy. A plasma membrane surrounds the cell, which is polarized, with basal, lateral, and apical domains. Its cytoplasm contains various organelles and inclusions, which surround a nucleus. Some organelles are membrane bound, but some are not. The apical cell border has many finger-like projections called microvilli. Lateral cell borders are areas with intercellular junctions.