The cell membrane, also called the plasma membrane or plasmalemma, is a semipermeable lipid bilayer common to all living cells. It contains a variety of biological molecules, primarily proteins and lipids, which are involved in a vast array of cellular processes. It also serves as the attachment point for both the intracellular cytoskeleton and, if present, the cell wall.
<a href="//commons.wikimedia.org/wiki/User:LadyofHats" title="User:LadyofHats">LadyofHats</a> Mariana Ruiz
Own work. Image renamed from <a href="//commons.wikimedia.org/w/index.php?title=File:Cell_membrane_detailed_diagram.svg&amp;action=edit&amp;redlink=1" class="new" title="File:Cell membrane detailed diagram.svg (page does not exist)">File:Cell membrane detailed diagram.svg</a>