Microvilli


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Microvilli

 

specialized outgrowths of the plasma membrane of epithelial cells in animals and man. Microvilli are 500–3,000 nanometers in length and their diameter ranges from 50 to 100 nm. There are several thousand microvilli in a single cell. Sometimes their arrangement is orderly, as in the striated (brushlike) edges of the epithelial cells of the small intestine, where the microvilli are about 20 nm from each other. Microvilli increase the cell surface. Cuticles in vertebrate animals also consist of microvilli.

References in periodicals archive ?
The microvilli of mucous epithelium cells were orderly and densely arranged on the juxtaluminal surface.
The supporting cells typically have apical microvilli that contribute to the cuticle and excrete lenses for the ocellus while leaving a small pore in the optical path of the sensory cell.
With fewer microvilli, the intestinal barrier was weakened, metabolism slowed and some nutrients - iron, zinc, and fatty acids, specifically were more difficult to absorb.
These vesicles are in the lumen near the microvilli, attesting that the absorptive cell can play the role of secretory cell according to the physiological demand.
Cells of distal convoluted tubules were lightly stained, more nuclei present per section as the cells are smaller and microvilli were absent (Fig.
4: SEM observation showing normal mucosal folds (MF) surrounded by oval or round shaped CEC and stubby microvilli (MV).
Ultrastructural examination revealed an incomplete lumen formed by neoplastic cells that was lined by cells with microvilli.
Electron microscopy shows the characteristics of mesothelial cells-slender microvilli on the luminal surface of the cells, desmosomes, intracytoplasmic intermediate filaments, endoplasmic reticulum, and dilated mitochondria.
Although ultrastructural analysis were not performed, the increased fold height herein observed in fish fed dietary MOS for 30 days that did not reflect better growth could be explained by the impossibility to observe integrity of intestinal brush border and microvilli by optical microscopy (Sado et al.
9) Ultrastructurally, they display cells with abundant microvilli, with a brush border appearance resembling PCT, along with cells with complex cytoplasmic interdigitations reminiscent of intercalated cells of collecting ducts.
However, few villi having broad leaf-shaped with more number of microvilli and secretory pores (Fig.