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Membrane Junctions
Tight junctions- a series of integral proteins in the plasma membrane fuse together to form an impermeable junction that encircles the cell. This helps to prevent molecules from passing through the extracellular space between adjacent cells.
Desmosomes- bind neighboring cells together by thin linker filaments that extend from the plaques and interdigitate like a zipper in the intercellular space. These are abundant in tissues subjected to great mechanical stress as this arrangement distributes tension throughout a cellular sheet and reduces chance of tearing.
Gap junctions- a communicating junction that allows chemical substances to pass between adjacent cells. The cells are connected by hollow cylinders composed of transmembrane proteins
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