myofibril

myofibril
One of the fine longitudinal fibrils occurring in a skeletal or cardiac muscle fiber comprising many regularly overlapped ultramicroscopic thick and thin myofilaments. SYN: muscular fibril, myofibrilla. [myo- + Mod. L. fibrilla, fibril]

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myo·fi·bril .mī-ō-'fīb-rəl, -'fib- n one of the longitudinal parallel contractile elements of a muscle cell that are composed of myosin and actin
myo·fi·bril·lar -rə-lər adj

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n.
one of numerous contractile filaments found within the cytoplasm of striated muscle cells. When viewed under a microscope myofibrils show alternating bands of high and low refractive index, which give striated muscle its characteristic appearance.

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myo·fi·bril (mi″o-fiґbril) muscle fibril: one of the slender threads that can be made visible in a muscle fiber by maceration in certain acids. They run parallel with the long axis of the fiber, and are composed of numerous myofilaments (q.v.). See Plate 32. myofibrillar adj

Medical dictionary. 2011.

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Look at other dictionaries:

  • Myofibril — 1. Axon 2. Neuromuscular junction 3. Muscle fiber 4. Myofibril Latin myofibrilla MeSH …   Wikipedia

  • myofibril — [mī΄ə fī′brəl] n. any of a number of tiny, contractile fibrils composed of actomyosin and bundled together within a muscle cell …   English World dictionary

  • myofibril — noun Etymology: New Latin myofibrilla, from my + fibrilla fibril Date: 1898 any of the longitudinal parallel contractile elements of a muscle cell that are composed of myosin and actin • myofibrillar adjective …   New Collegiate Dictionary

  • myofibril — Long cylindrical organelle of striated muscle, composed of regular arrays of thick and thin filaments, and constituting the contractile apparatus …   Dictionary of molecular biology

  • myofibril — /muy euh fuy breuhl, fib reuhl/, n. Cell Biol. a contractile fibril of skeletal muscle, composed mainly of actin and myosin. [1895 1900; MYO + FIBRIL] * * * ▪ physiology       very fine contractile fibres, groups of which extend in parallel… …   Universalium

  • myofibril — noun Cylindrical organelles, found within muscle cells, that are the contractile unit of muscles. Syn: sarcostyle …   Wiktionary

  • myofibril — [ˌmʌɪə(ʊ) fʌɪbrɪl] noun any of the elongated contractile threads found in striated muscle cells …   English new terms dictionary

  • myofibril — myo·fibril …   English syllables

  • myofibril — n. one of numerous contractile filaments found within the cytoplasm of striated muscle cells. When viewed under a microscope myofibrils show alternating bands of high and low refractive index, which give striated muscle its characteristic… …   The new mediacal dictionary

  • myofibril — my•o•fi•bril [[t]ˌmaɪ əˈfaɪ brəl, ˈfɪb rəl[/t]] n. hic (lab cbl) a contractile fibril of skeletal muscle, composed mainly of actin and myosin • Etymology: 1895–1900 …   From formal English to slang

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