A cell junction is a structure within a tissue of a multicellular organism. Cell junctions are especially abundant in epithelial tissues. They consist of protein complexes and provide contact between neighbouring cells, between a cell and the extracellular matrix, or they build up the paracellular barrier of epithelia and control the paracellular transport.
In vertebrates, there are three major types of cell junctions:
Cell junction molecules
The molecules responsible for creating cell junctions include various cell adhesion molecules.
Histology: epithelial tissue
|Types||Columnar (simple, stratified) - Cuboidal (simple, stratified) - Pseudostratified - Respiratory - Squamous (simple, stratified) - Transitional - Olfactory|
|Features||Lateral/cell-cell: Tight junction - Adherens junction - Desmosome - Gap junction|
Basal/cell-matrix: Basal lamina - Hemidesmosome - Focal adhesion
Apical: Cilia - Microvilli - Stereocilia
Structures of the cell membrane
|Caveolae/Coated pits - Cell junctions - Glycocalyx - Lipid raft/microdomains - Myelin sheath - Nodes of Ranvier - Nuclear envelope - Phycobilisomes|
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