The word Cytoplasm is formed from the Greek words cyto meaning cell and plasma meaning formed. The protoplasmic part of the cell surrounded by the cell membrane located outside the nucleus is called cytoplasm. Organelles and non-living matter in the cytoplasm are collectively called trophoplasm. It is now called the cytosol. The outer denser and less granular region of the cytosol is called ectoplasm and the inner less dense region is called endoplasm. The translucent, granular, homogeneous and colloidal fluid of the cytoplasm is called cytomatics or hyaloplasm. If the cytoplasm is like a thin membrane around the cell, it is called tonoplasm. Organelles that contain cytoplasm are called cytoplasmic organelles. American biochemist H. A. Lardy coined the term cytosol in 1965.