Structure of cell membrane
The cell membrane (also called the plasma membrane, plasmalemma, or phospholipid bilayer) is the interface between the cellular machinery inside the cell and the fluid outside. It surrounds all living cells. It is a semipermeable lipid bilayer found in all cells. It controls how substances can move in and out of the cell and is responsible for many other properties of the cell as well. The membranes that surround the nucleus and other organelles are almost identical to the cell membrane. Membranes are composed of phospholipids, proteins and carbohydrates arranged in a fluid mosaic structure, as shown in this diagram. The plasma membrane also serves as the attachment point for both the intracellular cytoskeleton and, if present, the extracellular cell wall.
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