Fluid mosaic model
The fluid mosaic model was first discovered by S.J.Singer and G.L.Nicolson in 1972 by examining freeze-fracture electron micrographs. From their results, it was identified that the membrane consists of a lipid bilayer, consisting of hydrophillic phosphate heads facing the cells aquous solution; and hydrophobic fatty acid tails burried in towards the centre of the membrane.
<D.U.Silverthorn, 2010, Human Physiology, 5(3:56-7), Sanfransicso, Pearson education/>