actomyosin

Myofibrils (obsolete term: sarcostyles) are cylindrical organelles, found within muscle cells. They are bundles of actomyosin filaments that run from one end of the cell to the other and are attached to the cell surface membrane at each end. Actomyosin motors are important in muscle contraction (relying in this case on "classical myosins") as well as other processes like retraction of membrane blebs, filiopod retraction, and uropodium advancement (relying in this case on "nonclassical myosins").
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Actomyosin /ac·to·my·o·sin/ the complex of actin and myosin occurring in muscle fibers. ac·to·my·o·sin n. [more]Actomyosin - Community and Resources

Noun
1. a protein complex in muscle fibers; composed of myosin and actin; shortens when stimulated and causes muscle contractions
(hypernym) protein
(substance-meronym) actin

noun
combination of actin and myosin, which forms the contractile tissue of muscle

ATTOMIOSINA