Definition of sarcomere in English:


Syllabification: sar·co·mere
Pronunciation: /ˈsärkəˌmi(ə)r


  • A structural unit of a myofibril in striated muscle, consisting of a dark band and the nearer half of each adjacent pale band.
    More example sentences
    • The actin filaments found in the sarcomeres of striated muscles, as well as in stress fibers and microvilli in nonmuscle cells, are stable, unbranched structures.
    • Electron microscopy was used to examine ultrastructural evidence of injury, including sarcomeric disruption, disorganisation of myofilaments, misalignment of adjacent sarcomeres, and distortion or absence of Z-lines.
    • Gradually, new sarcomeres (contractile units) are laid down to share the work load and reduce the wall stress.


late 19th century: from Greek sarx, sark- 'flesh' + meros 'part'.

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