The cell membrane is arranged into a polar structure known as a "phospholipid bilayer" which is made up of many phospholipids. The phospholipid has a hydrophilic (water loving) head and two hydrophobic fatty acid tails (water hating). The long chain of phospholipids includes two phospholipids with their tails pointing towards each other and the hydrophilic heads pointing away from each other into the intracellular and extracellular spaces of the cell.
There are many more features of the biological cell membrane such as; peripheral and integral membrane proteins, glycoproteins (protein with carbohydrate attached), glycolipids (lipid with carbohydrate attached), aqua pores, transport proteins and cholesterol. All of these features are critical for the integrity of the plasma membrane and consequently, the function of the cell.