myofibril

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myofibril

 [mi″o-fi´bril]
one of the slender threads of a muscle fiber, composed of numerous myofilaments; called also muscle fibril. adj., adj myofi´brillar.
Bundles of myofibrils in a muscle. From Damjanov, 2000.

my·o·fi·bril

(mī'ō-fī'bril),
One of the fine longitudinal fibrils occurring in a skeletal or cardiac muscle fiber comprising many regularly overlapped ultramicroscopic thick and thin myofilaments.
[myo- + Mod. L. fibrilla, fibril]

myofibril

(mī′ə-fī′brəl, -fĭb′rəl)
n.
Any of the threadlike fibrils that make up the contractile part of a striated muscle fiber and are made up chiefly of actin and myosin filaments.

myofibril

A bundle of contractile fibres within muscle cells.

my·o·fi·bril

(mī'ō-fī'bril)
One of the fine longitudinal fibrils occurring in a skeletal or cardiac muscle fiber and consisting of many regularly overlapped ultramicroscopic thick and thin myofilaments.
[myo- + Mod. L. fibrilla, fibril]

myofibril

a microscopic contractile filament of STRIATED MUSCLE, made up of a series of SARCOMERES. The myofibril is made up of numerous longitudinal filaments of two forms, thick (MYOSIN) and thin (ACTIN). See MUSCLE, I-BAND. Relatively little is known of the contraction of smooth muscle, where contractile elements’ are thought to contain both actin and myosin.
References in periodicals archive ?
For the first time, it is now possible to investigate how the formation of regular structures and the generation of mechanical forces go hand in hand during the self-assembly of myofibrils.
The micrographs show mitochondria (m), myelin figures (M), well-organized myofibrils forming intact sarcomeres (S) and a system formed by sarcoplasmic reticulum and t tubule-triads (t), areas with disorganized Z lines and thinning sarcomeres (arrows), swollen sarcoplasmic reticulum and dilated T tubes (arrowheads) and areas with disrupted sarcomeres (*).
Abbreviations: (AS) subcutaneous adipose (AV) visceral adipose (FB) white fibers (FM) muscle fibers (FI) intermediate fibers (FV) red fibers (m) myofibrils (ms) myosepta (n) nucleus (P) skin.
Studies taking an anatomical approach tend to use immunocytochemistry or electron microscopy to evaluate sarcomere formation and myofibril alignment as indicators of myotube maturity.
Accumulation of Ca2+ will activate calpain 3 kinase that in turn cause degradation of myofibrils. Ubiquitin ligases will ubiquitinate the peptides and target them for degradation in the proteasome.
Shinano, "Effect of Storage Temperature on Freeze Denaturation of Carp Myofibrils with KC1 or NaCl," Nippon Suisan Gakkaishi, vol.
Rhabdomyolysis (RM) is the destruction of skeletal muscle followed by the release of intracellular myofibrils into the bloodstream and extracellular fluid.
Effect of different sources and levels of distillers dried grains with solubles on production on performance, serum biochemistry, bone parameters, carcass quality, and properties of myofibrils. PhD thesis.
Contraction band necrosis describes a focal alteration in muscle architecture due to hypercontraction of myofibrils in myocardial cells, producing dense groupings of myofibrils interspersed between clear areas of muscle, barren of myofibrils due to lysis [28].
Transmission electron microscopy showed normal mitochondria packed beside the fibers and typical, symmetric myofibrils composed of Z lines with sarcomeres in the control and DHM-treated control mice.
While insufficient biogenesis limits ATP production and induces cell necrosis [89], an excessive production of mitochondria leads to disruption of myofibrils and cardiomyocyte dysfunction [90].
Histopathological examination of ISO-treated rat heart showed marked myocardial necrosis, inflammatory cell infiltration, edema and vacuolization of myofibrils. The ultrastructural sections also revealed degenerated myofibrils, disintegrated mitochondria and swollen cristae in the rats treated with ISO-control.