myofibril


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Related to myofibril: myofilament, sarcoplasmic reticulum

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

/myo·fi·bril/ (-fi´bril) muscle fibril; one of the slender threads of a muscle fiber, composed of numerous myofilaments. myofi´brillar

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

[-fī′bril]
Etymology: Gk, mys + L, fibrilla, small fiber
a slender striated strand within skeletal and cardiac muscle fibers and composed of bundles of myofilaments. Myofibrils occur in groups of branching threads running parallel to the cellular long axis of the fiber.
enlarge picture
Molecular structure of a myofibril

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.

myofibril

a longitudinal, multicellular fibre, characteristic of striated (i.e. skeletal and cardiac) muscle, formed of actin and myosin filaments; Ca2+ interaction between actin/myosin causes increasing linear overlap of these protein molecules, with resultant muscle tension/contraction

myofibril

a muscle fibril, one of the slender threads of a muscle fiber, composed of numerous myofilaments.
References in periodicals archive ?
Previous studies have shown that the release and degradation from myofibrils Z-line of [alpha]-actin in postmortem white dorsal muscle are time- and temperature-dependent processes that take place during the early stages of fish storage (Papa et al.
Means of myofibril diameter and sarcomere length of the C, 25R and 40R groups are presented in Table 1.
This phenomena is called myofibril hypertrophy (as discussed by Alway, Winchester, Davis et al, 1989) or hyperplasia (as discussed by Antonio and Gonyea, 1993).
Hearts from SHS-treated rats stained with Masson trichrome showed extensive fibrosis and myofibril disarray at the 200X magnification (Figure 1C).
The effect of projectin's absence or reduction on IFM myofibril assembly is also investigated by immunofluorescence microscopy on pupal and adult samples.
While a number of viruses are capable of causing rhabdomyolysis in humans, the significance of myofibril damage associated with viral infections of the lung has not been well described.
Structural abnormalities included loss of lateral alignment of myofibrils, perturbation of myofibril anchorage to the sarcolemma, abnormal mitochondrial number and organization, and loss of nuclear shape and positioning.
The thin protein filaments located with the myofibril of the muscle.
Therefore, it appears that the loss of myofibrillar-related protein function and the subsequent reduction of myofibril integrity could have increased the drip loss in LWY.
MANRIQUE (2015) described Myxobolus parasitizing skeletal muscle in Piaractus mesopotamicus (HOLMBERG, 1887); although, in contrast with the present study, only myofibril degeneration was observed in this species rather than the inflammatory infiltrates detected in R.