Microvilli

Microvilli (microvilli, lnh; synonym microvilli) are numerous tiny outgrowths of the apical surface of epithelial cells that increase the absorption surface of the cell. They are finger-like protrusions of the plasma membrane containing actin microfilaments.

Microvilli were first described in the intestinal epithelium, where they significantly increase the absorptive surface. However, they are also present on many other cells that perform absorptive or secretory functions, for example in the renal tubules. Their length is about 1 µm and their diameter is about 0.1 µm.

Microvilli play an important role in increasing the efficiency of absorption of nutrients and other biologically active compounds. Their violations can lead to the development of various diseases of the digestive, urinary and other systems.