So in this double layer we have the polar heads orient themselves towards the aqueous environment while the nonpolar tails aggregate on the inside to form a barrier, the hydrophobic barrier. So the interior of the cell membrane. The lipid bilayer is hydrophobic because it consists predominantly of these tails, while the outside and the inside portion of this bilayer consists of these heads. And those are the polar regions. They can interact with each other as well as with the water molecules found on the aqueous environment. So another major difference between this bimolecular sheets and the my cell is inside the MiCell, because we don't have any polar region, there's really no aqueous environment on the inside.