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Intercellular cleft
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Intercellular cleft : ウィキペディア英語版
Intercellular cleft
An intercellular cleft is a channel between two cells through which molecules may travel and gap junctions and tight junctions may be present. Most notably, intercellular clefts are found between epithelial cells and the endothelium of blood vessels and lymphatic vessels, also helping to form the blood-nerve barrier surrounding nerves. Intercellular clefts are important for allowing the transportation of fluids and small solute matter through the endothelium.
== Dimensions of Intercellular Cleft ==

The dimensions of intercellular clefts vary throughout the body, however cleft lengths have been determined for a series of capillaries. The average cleft length for capillaries is about 20m/cm2. The depths of the intercellular clefts, measured from the luminal to the abluminal openings, vary among different types of capillaries, but the average is about 0.7 μm. The width of the intercellular clefts is about 20 nm outside the junctional region (i.e. in the larger part of the clefts). In intercellular clefts of capillaries, it has been calculated that the fractional area of the capillary wall occupied by the intercellular cleft is 20m/cm2 x 20 nm (length x width)= 0.004 (0.4%). This is the fractional area of the capillary wall exposed for free diffusion of small hydrophilic solutes and fluids5.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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