But in this particular case, this entire lipid bilayer extends to form this globular, this circular structure. And notice we have an aqueous environment on the inside and the outside of that structure because we have these two leaflets and they both contain these polar regions that contract with the water molecules on either side of that membrane. So we have an aqueous environment on either side of this structure, but an aqueous environment only exists on the outside of this structure. So what types of lipids actually form the lipid bilayer? Well, the bulk here lipids, the larger lipids. So unlike fatty acids, things like glycolipids or phospholipids or cholesterol molecules, these are too large to fit Snugly on the interior structure of the myosoline.