microvillus


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microvillus

 [mi″kro-vil´us]
a minute process or protrusion from the free surface of a cell, found especially in the proximal convolution of renal tubules and the intestinal epithelium. See illustration.
Microvilli in the intestinal tract. From Applegate, 1992.

mi·cro·vil·lus

, pl.

mi·cro·vil·li

(mī-krō-vil'ŭs, -vil'ī),
One of the minute projections of cell membranes greatly increasing surface area; microvilli form the striated or brush borders of certain cells.

mi·cro·vil·lus

, gen. and pl. microvilli (mī'krō-vil'ŭs, -ī)
One of the minute projections of cell membranes greatly increasing surface area; microvilli form the striated or brush borders of certain cells.

microvillus

a minute finger-like process found in numbers projecting from the cell surface where, in epithelium, they form a brush border. Microvilli are found, for example, on the villi lining the small intestine.
References in periodicals archive ?
The microvilli are marked with arrows; green arrow: double microvilli (see the text); red arrow: a radially cut microvillus, with axial symmetry.
Note the ciliated non-sensory cells (CN), microvillus (MV), and supporting cells (S) and rod cells (RD).
Loss-of-function of MYO5B is the main cause of microvillus inclusion disease: 15 novel mutations and a CaCo-2 RNAi cell model.
The relationship is very strong, but the volume fraction occupied by rhabdomeres in the rhabdomeric layer, the numerical density of the microvilli in the rhabdomere, and the diameter of each microvillus show an inconspicuous growth.
"Sameerah was suffering from microvillus inclusion disease and was very seriously ill," he said.
Hospital consultant Dr Gale Pearson said Sameerah had been born with microvillus inclusion disease, which affects one in 10,000, adding: "It can be life threatening."
The enterocele cells with microvillus and glycoprotein coating are involved in absorbing oral insulin, digesting food with sugar, liquids, secretions, etc.
A small pore is created in the vitelline layer, through which the sperm nuclear filament is extended to meet and fuse with an egg microvillus. Penetration of the egg by one sperm induces the cortical granule reaction, and a fertilization membrane is raised after a few minutes.
Increases in intracellular calcium levels can result in the depolymerization of actin by villin (a calcium-dependent microvillus protein) and a breakdown of the host cytoskeleton not unlike that seen in EPEC-infected cells (24).
Indications for the use of HPN in children are short bowel syndrome (SBS), chronic intestinal pseudo-obstruction (CIP), intractable diarrhea, congenital microvillus atrophy, and Crohn's disease (Dahlstrom, Strandvik, Kopple, & Ament, 1985; Ricour, 1989).
Each microvillus contains 20 structures called microfilaments, which function much like the poles supporting a tent.