Brush border
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
A brush border (or striated border) is the name for the microvilli-covered surface of pseudostratified columnar epithelium found in multiple locations of the body. While the individual cilia can be distinguished using electron microscopes,[1] with a light microscope they can usually only be seen collectively, as a fuzzy fringe at the surface of the epithelium.
They are found in two main locations:
- The small intestine tract: This is where absorption takes place.[2][3][4]
- The kidney: Here the brush border is useful in distinguishing the proximal tubule (which possesses the brush border) from the distal tubule (which does not).[5][6][7]