1. Hydrophilic Head: This portion of the molecule is attracted to water. It consists of a phosphate group and a glycerol backbone. This head is polar and forms hydrogen bonds with water, allowing the phospholipid to interact with the aqueous environment both inside and outside the cell.

2. Hydrophobic Tails: These are made up of two long fatty acid chains. They are repelled by water and are nonpolar. The tails are hydrophobic and orient themselves away from water, forming the interior of the cell membrane.

This structure gives the cell membrane its unique properties:

* Selective permeability: The hydrophobic interior restricts the passage of most molecules, while the hydrophilic exterior allows for interactions with the aqueous environment.

* Fluid mosaic model: The phospholipids can move laterally within the membrane, allowing for flexibility and dynamic changes in membrane structure.

* Barrier: The phospholipid bilayer acts as a barrier to protect the cell from its surroundings.

It's important to remember that the cell membrane isn't just made of phospholipids. It also contains proteins, cholesterol, and other components that contribute to its function.