== Cells, Organelles, and Inclusions ==

To begin the study of cellular structure, you are asked to identify several kinds of cells, cellular specializations and inclusions of cells. Learn to distinguish between the nucleolus, the nucleus, and the cytoplasm of a cell. Observe the appearance of the chromatin, the position of the nucleus within the cell and the staining characteristics of the cytoplasm. Note the size of the cells, the density of similar cells, and their arrangement in the tissue. As you study the different cell types, keep in mind that sectioned material is being observed and that the appearance of the cell may vary depending on the plane of section.