A layer of densely packed microvilli projecting from the inside surface of a tubular passage
Brush borders are those found in the luminal (inner) surfaces of the small intestine and the proximal tubule of the kidney. They are made up of numerous microvilli projecting at the free surface of epithelial lining. The presence of microvilli greatly increase the surface area for absorption.
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... protein/histamine-rich granules. The surface villi reminded me a lot of brush border cells, which can also have vesicles and granules, but they aren't usually so prominent--but, ...
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