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A sarcomere (Greek σάρξ sarx "flesh", μέρος meros "part") is the smallest functional unit of striated muscle tissue. [1] It is the repeating unit between two Z-lines. Skeletal muscles are composed of tubular muscle cells (called muscle fibers or myofibers) which are formed during embryonic myogenesis .
The sarcolemma (sarco (from sarx) from Greek; flesh, and lemma from Greek; sheath), also called the myolemma, is the cell membrane surrounding a skeletal muscle fibre or a cardiomyocyte.
The names of the various sub-regions of the sarcomere are based on their relatively lighter or darker appearance when viewed through the light microscope. Each sarcomere is delimited by two very dark colored bands called Z-discs or Z-lines (from the German zwischen meaning between). These Z-discs are dense protein discs that do not easily allow ...
Why does the last section repeated spell the word "sacromere" instead of "sarcomere?" The opening phrase should give context: "In anatomy..." might be right but I won't interfere. --Wetman 19:46, 28 Mar 2005 (UTC)
The costamere is a structural-functional component of striated muscle cells [1] which connects the sarcomere of the muscle to the cell membrane (i.e. the sarcolemma). [ 2 ] Costameres are sub-sarcolemmal protein assemblies circumferentially aligned in register with the Z-disk of peripheral myofibrils .
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In addition to sarcomere activity, it has been shown that myomesin also plays a role in the assembly of the sarcomere. In order for myomesin to be implemented into the sarcomere, myosin and titin must be present, indicating that myomesin is the last component to be added during assembly of the lattice.