brush border

border /bor·der/ (bor´der) a bounding line, edge, or surface.

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brush border  a specialization of the free surface of a cell, consisting of minute cylindrical processes (microvilli) that greatly increase the surface area.

vermilion border  the exposed red portion of the upper and lower lips.

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brush border

n.

An epithelial cell surface consisting of microvilli, as on the cells of the proximal tubule of the kidney.

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brush border,

microvilli on the free surfaces of certain epithelial cells, particularly the absorptive surfaces of the intestine and the proximal convoluted tubules of the kidney.

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brush border

a specialization of the free surface of a cell, consisting of minute cylindrical processes (microvilli) that greatly increase the surface area.

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brush border enzymes

include maltase, lactase, α-dextrinase and peptidases. Deficiencies of these enzymes may be primary or, more often, secondary to other intestinal disease.

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brush border

Physiology A specialized portion of the free or apical aspect of certain epithelial cells–eg, of the GI tract, consisting of closely packed microvilli that facilitate absorption; brush border cells line the luminal surface of the intestine and proximal convoluted tubules of the kidneys; the BB contains absorptive microvilli and glycocalyx–which is rich in hydrolytic enzymes