The epithelium which covers the intestinal villi is composed of absorptive cells, goblet cells, a few endocrine cells and tuft or calveolated cells. The goblet and endocrine cells closely resemble those found in the crypts. The tuft or calveolated cells are characterized by long, broad apical microvilli and an intra-cytoplasmic system of tubules and vesicles. These cells are uncommon and their function is not known. The absorptive cells or enterocytes are tall, columnar cells, with their nuclei located close to their base.
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