Concept 4 Review: Desmosomes
Desmosomes appear as thickened patches in the cell membrane region between two cells. Desmosomes contain specialized proteins–such as keratin (the same protein found in fingernails and hair), desmoplakin, and desmin filaments–that increase the rigidity of tissues.

The most common type of desmosome–spot desmosomes–are found in epithelium, smooth muscle, and many other animal tissues. These are buttonlike junctions that bind cells together and also function as anchors for fibers in the cytoskeleton.

A Closer Look at Desmosomes
Gap Junctions
Tight Junctions