tight junction A region of the cell surface, of variable size, and situated just below the apical border where the membranes of adjacent cells are fused to form a pentalaminar structure. In simple epithelial layers tight junctions often form a continuous layer (the zonula occludens). Their function appears to be the provision of areas of contact between cells of enhanced permeability and low electrical resistance. They occur in tissues such as the blood-brain barrier and cardiac muscle, where such features are advantageous.
tight junction (zonula occludens) The region between the plasma membranes of two adjacent cells that are so closely positioned that there is no intercellular space between them. This type of junction fuses cells together and provides a selective barrier to the diffusion of substances between cells. Tight junctions are common between cells of the intestinal epithelium, where they act to seal off the intestinal lumen from the intercellular fluid. See also cell junction.
More From encyclopedia.com
Cells , Cells Plants are multicellular organisms composed of millions of plant cells. Although individual cells may differ greatly from each other in mature… killer cell , killer cell Either of two types of lymphocyte that destroy infected or cancerous host cells. Natural killer cells are distinct from both T cells and… Schwann Cell , Schwann cell (neurilemma cell) A cell that forms the myelin sheath of a nerve fibre. Each cell is responsible for a single length of the fibre (calle… desmosome , desmosome (macula adherens) A patchlike junction found between adjacent cells in epithelial tissues that helps strengthen the tissue by binding the c… Basement Membrane , basement membrane (basal lamina) A thin sheet of fibrous proteins that underlies and supports the cells of an epithelium, separating this from underl… T Cell , T cell T cell (T lymphocyte) Any of a population of lymphocytes that are the principal agents of cell-mediated immunity. T cells are derived from the…
About this article
All Sources -
Updated Media sources (1) About encyclopedia.com content Print Topic
You Might Also Like