The Fluid Mosaic Model
Our understanding of the structure of the plasma membrane can best be described using the Fluid Mosaic Model. The model states that the membrane is not a static network of lipids and proteins, but rather a dynamic matrix that is constantly in motion. In other words, it is fluid. The molecules do not pack together to form a solid layer. Since different types of molecules (i.e., lipids and proteins) make up the membrane, it is said to be mosaic.