MICROVILLI OF THE HUMAN JEJUNAL EPITHELIAL CELL

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Abstract
The microvillous border of the jejunal epithelial cell was studied in 5 patients with normal gastrointestinal function. The epithelium was divided into 3 zones: crypts, intervillous surface, and villous crest. Microvilli in each of these zones were measured with regard to height, diameter, and number per unit length of cell surface. The microvilli were short, wide, and relatively few in number in the crypts. In the intervillous areas and on the villous crest, the microvilli became progressively higher, thinner, and more numerous. A corresponding increase in surface area of the microvilli occurred along with a decrease in volume. Mensuration data for the microvilli in each of the 3 sites are given.