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In the cell membrane, hydrophilic heads orient to the inside and outside of the membrane, with the hydrophobic molecules inside. This gives the membrane its semi permeable fluid nature.he hydrophilic region in the cell is water-loving and it  attracts the water molecules. It is basically composed of polar  groups which readily dissolve and absorb water.
The hydrophilic heads are on the outer part of the bilayer because they are water loving. Whereas the hydrophobic tails are on the inner part of the bilayer for two reasons.First, they are hydrophobic or water fearing so they will repel water. An example of hydrophobic is oil in water.he hydrophilic heads are on the outer part of the bilayer because they are water loving. Whereas the hydrophobic tails are on the inner part of the bilayer for two reasons.