brush border .brəsh- n a stria of microvilli on the plasma membrane of an epithelial cell (as in a kidney tubule) that is specialized for absorption
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a specialization of the free surface of certain cells, consisting of minute cylindrical processes (microvilli) that greatly increase the surface area; in vertebrates these are found especially on the cells of the proximal convoluted tubules of the kidney and on the intestinal epithelium.
Brush border in a scanning electron micrograph of rat kidney proximal tubule, characterized by closely packed microvilli.
Medical dictionary. 2011.