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Any of the actin-containing filaments that are found in the cytoplasm of eukaryotic cells and are involved in generating cell movement, providing structural support, and organizing internal cell components. Microfilaments, along with intermediate filaments and microtubules, make up a cell's cytoskeleton.

mi′cro·fil′a·men′tous (-mĕn′təs) adj.


(Biochemistry) thin filament, composed of the protein actin and associated proteins, that occurs abundantly in muscle and in the cytoplasm of other cells


(ˌmaɪ krəˈfɪl ə mənt)

a tubelike protein structure that is involved in cell movement and changes in cell shape.
mi•cro•fil•a•men•tous (ˌmaɪ kroʊˌfɪl əˈmɛn təs) adj.
References in periodicals archive ?
Peclet et al., "a-smooth muscle actin, a differentiation marker of smooth muscle cells, is present in microfilamentous bundles of pericytes," Journal of Histochemistry and Cytochemistry, vol.
Confocal microscopy images of F-actin stained with Phalloidin showed that, in PEG 35 pretreated livers, filamentous actin associated with the membrane microfilamentous network and the pericanalicular band are kept preserved (Figure 5(a)).
Howard, "An inherited defect of neutrophil motility and microfilamentous cytoskeleton associated with abnormalities in 47-Kd and 89-Kd proteins," Blood, vol.