cytoskeleton


cytoskeleton
cytoskeletal, adj.
/suy'teuh skel"i tn/, n. Cell Biol.
a shifting lattice arrangement of structural and contractile components distributed throughout the cell cytoplasm, composed of microtubules, microfilaments, and larger filaments, functioning as a structural support and transport mechanism.
[CYTO- + SKELETON]

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System of microscopic filaments or fibres, present in the cytoplasm of eukaryotic cells (see eukaryote), that organizes other cell components, maintains cell shape, and is responsible for cell locomotion and for movement of the organelles within it.

Three major types of filaments make up the cytoskeleton: actin filaments, microtubules, and intermediate filaments. Actin filaments occur as constantly changing bundles of parallel fibres; they help determine cell shape, help the cell adhere to surfaces, help the cell move, and assist in cell division during mitosis. Intermediate filaments are very stable structures that form the cell's true skeleton; they anchor the nucleus within the cell and give the cell its elastic properties.

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      a system of filaments or fibres that is present in the cytoplasm of eukaryotic cells (cell) (cells containing a nucleus). The cytoskeleton organizes other constituents of the cell, maintains the cell's shape, and is responsible for the locomotion of the cell itself and the movement of the various organelles within it. The filaments that comprise the cytoskeleton are so small that their existence was only discovered because of the greater resolving power of the electron microscope.

      Three major types of filaments make up the cytoskeleton: actin filaments, microtubules (microtubule), and intermediate filaments. Actin filaments occur in a cell in the form of meshworks or bundles of parallel fibres; they help determine the shape of the cell and also help it adhere to the substrate. The constantly changing arrays of actin filaments help move the cell and mediate specific activities within it, such as cell cleavage during mitosis. Microtubules are longer filaments that are constantly assembling and disassembling; they play a crucial role in moving the daughter chromosomes to the newly forming daughter cells during mitosis, and bundles of microtubules form the cilia and flagella found in protozoans and in the cells of some multicellular animals. Intermediate filaments, in contrast to actin filaments and microtubules, are very stable structures that form the true skeleton of the cell. They anchor the nucleus and position it within the cell, and they give the cell its elastic properties and its ability to withstand tension.

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Universalium. 2010.

Look at other dictionaries:

  • cytoskeleton — cy to*skel e*ton (s[imac] t[ o]*sk[e^]l [i^]*t n), n. (Cell Biology) An arrangement of microtubules, microfilaments, and larger filaments within a cell serving to provide structural support of components of the cell, and to transport components… …   The Collaborative International Dictionary of English

  • Cytoskeleton — The eukaryotic cytoskeleton. Actin filaments are shown in red, microtubules in green, and the nuclei are in blue. The cytoskeleton (also CSK) is a cellular scaffolding or skeleton contained within a cell s cytoplasm and is made out of protein.… …   Wikipedia

  • cytoskeleton — General term for the internal components of animal cells which give them structural strength and motility: plant cells and bacteria use an extracellular cell wall instead. The major components of cytoskeleton are the microfilaments (of actin),… …   Dictionary of molecular biology

  • cytoskeleton — The tonofilaments, keratin, desmin, neurofilaments, or other intermediate filaments serving to act as supportive cytoplasmic elements to stiffen cells or to organize intracellular organelles. * * * cy·to·skel·e·ton .sīt ō skel ət ən n the network …   Medical dictionary

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  • Cytoskeleton — ląstelės griaučiai statusas T sritis histologija atitikmenys: lot. Cytoskeleton ryšiai: platesnis terminas – citoplazmos organelės ir intarpai …   Medicininės histologijos ir embriologijos vardynas

  • cytoskeleton — noun Date: 1940 the network of protein filaments and microtubules in the cytoplasm that controls cell shape, maintains intracellular organization, and is involved in cell movement • cytoskeletal adjective …   New Collegiate Dictionary

  • cytoskeleton — (si to skel ē ton) A network of microfilaments, microtubules, intermediate filaments, and other components in the cytoplasm of eucaryotic cells that helps give them shape …   Dictionary of microbiology

  • cytoskeleton — noun A cellular structure like a skeleton, contained within the cytoplasm …   Wiktionary

  • cytoskeleton — noun Biology a microscopic network of protein filaments and tubules in the cytoplasm of many living cells, giving them shape and coherence. Derivatives cytoskeletal adjective …   English new terms dictionary


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