/muy'kroh tooh"byoohl, -tyooh"-/, n. Cell Biol.
a hollow cylindrical structure in the cytoplasm of most cells, involved in intracellular shape and transport. See diag. under cell.
[1960-65; MICRO- + TUBULE]

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Tubular structure enclosed by a membrane found within animal and plant cells.

Of varying length, they have several functions. They help give shape to many cells and are major components of cilia and flagella, participate in the formation of the spindle during cell division (mitosis), and assist the movement of vesicles from the cell bodies of nerve cells toward the ends of those cells' long extensions (axons) and back to the cell bodies.

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      tubular structure of indefinite length, constructed from globular proteins called tubulins, which are found only in eukaryotic cells. Microtubules have several functions. For example, they provide the rigid, organized components of the cytoskeleton that give shape to many cells, and they are major components of cilia and flagella (cellular locomotory projections). They participate in the formation of the spindle during cell division (mitosis). They also assist the movement of organelles (e.g., mitochondria), as well as the movement of vesicles from the cell bodies of neurons to the axonal tips and back to the cell bodies.

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Universalium. 2010.

Look at other dictionaries:

  • microtubule — [ mikrotybyl ] n. m. • av. 1972; en angl. 1963; de micro et tubule ♦ Biol. Composant du cytosquelette, formé par polymérisation de la tubuline. ● microtubule nom masculin Fine structure cytoplasmique cylindrique, constituant des centrioles, des… …   Encyclopédie Universelle

  • microtubule — microtubule. См. микротрубочка. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • microtubule —  Microtubule  Микротрубочка   Полая цилиндрическая трубочка, используемая для транспортировки веществ внутри клетки.    Строение микротрубочки, в которой 13 тубулиновых α /β гетеродимеров уложены по окружности полого цилиндра. Внешний диаметр… …   Толковый англо-русский словарь по нанотехнологии. - М.

  • microtubule — [mī΄krō to͞o′byo͞ol΄] n. any of a number of small, hollow filaments, composed of long strands of tubulins, that are found in animal or plant cells and are associated esp. with cell structure and movement and with mitosis …   English World dictionary

  • Microtubule — Space filling model of a microtubule segment derived from cryo electron microscopy. The protofilaments are seen running along the axis of the segment. The microtubule (+) end is towards the top of the image.[1] Microtubules are a component of the …   Wikipedia

  • Microtubule — Les microtubules (MT) sont des fibres constitutives du cytosquelette, au même titre que les microfilaments d actine et que les filaments intermédiaires. Ils ont un diamètre d environ 25 nm et une longueur variable du fait de leur dynamique (liée… …   Wikipédia en Français

  • microtubule — noun Date: 1961 any of the minute tubules in eukaryotic cytoplasm that are composed of the protein tubulin and form an important component of the cytoskeleton, mitotic spindle, cilia, and flagella • microtubular adjective …   New Collegiate Dictionary

  • microtubule — Cytoplasmic tubule, 25nm outside diameter with a 5nm thick wall. Made of tubulin heterodimers packed in a three start helix (or of 13 protofilaments looked at another way), and associated with various other proteins (MAPs, dynein, kinesin).… …   Dictionary of molecular biology

  • microtubule — noun small tubes made of protein and found in cells and is part of the cytoskeleton …   Wiktionary

  • microtubule — A hollow, cylindrical cytoplasmic element, 20–27 nm in diameter and of variable length, that occurs widely in the cytoskeleton, cilia, and flagella of cells; microtubules play a role in the maintenan …   Medical dictionary

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