What part of a phospholipid molecule is found in the middle of a lipid bi layer?

In a lipid bilayer, the hydrophobic tails of phospholipid molecules are found in the middle, facing each other. These tails are composed of long fatty acid chains that are non-polar and repel water. This arrangement creates a hydrophobic core, while the hydrophilic heads of the phospholipids face outward, interacting with the aqueous environment on both sides of the membrane. This structural organization is crucial for the integrity and functionality of cellular membranes.