Also found in: Dictionary, Encyclopedia.
Related to microfilaments: Intermediate filaments
microfilamentscontractile filaments that control organization and cell shape, through fimbria action; e.g. intracellular (in muscle cells as actin and myosin, in non-muscle cells as truncated myosin, in cytoplasm as actomyosin gel) and submembrane (immediately beneath the cell membrane)
n.pl any of the submicroscopic cellular filaments, such as the tonofibrils, found in the cytoplasm of most cells, that function primarily as a supportive system.