The word Cytology is formed from two Greek words kytos meaning cell and logos meaning discussion. Cytology means discussion of cells. The branch of biology that deals with the size, shape, type, physical and chemical structure, division, growth, development and biological functions of cells is called Cytology. The father of cytology is Robert Hooke (1635-1703). But the father of modern cytology is Carl P. Swanson (1911-1996).