The cell membrane consists of a phospholipid bilayer.
In the phospholipid bilayer, there is a hydrophilic phosphate head in contact with the aqueous environment, with two hydrophobic fatty acid tails that are not in contact with the aqueous environment.
In between phospholipids there is a cholesterol molecule.
There are glycoproteins and glycolipids.
The intrinsic protein spans the whole length of the cell membrane.
The extrinsic protein spans half the length of the cell membrane.
