blastema

blastema
—blastemal, blastematic /blas'teuh mat"ik/, blastemic /bla stee"mik, -steem"ik/, adj.
/bla stee"meuh/, n., pl. blastemas, blastemata /-meuh teuh/. Embryol.
an aggregation of cells in an early embryo, capable of differentiation into specialized tissue and organs.
[1840-50; < NL < Gk blástema (blaste- verbid s. of blasteîn to sprout + -ma n. suffix denoting result of action)]

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also called  Regeneration Bud,  

      in zoology, a mass of undifferentiated cells that has the capability to develop into an organ or an appendage. In lower vertebrates the blastema is particularly important in the regeneration of severed limbs. In the salamander, for example, tissues in the stump of a limb dedifferentiate—that is, they lose their individual characteristics—and revert to an embryonic appearance. Under the influence of regenerating nerve fibres, they will form a blastema, a mound of cells resembling the original limb bud, from which the replacement limb gradually emerges.

      In some invertebrates, such as flatworms, reserve cells scattered throughout the body supply the cells of blastemas. In vertebrates, dedifferentiated skin and muscle cells at the site of a wound constitute the developing blastema. If for any reason the regenerating nerve fibres are damaged or destroyed, the blastema will fail to develop and scar tissue will form instead.

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Universalium. 2010.

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Look at other dictionaries:

  • blastemă — blastémă s. f., pl. blastéme Trimis de siveco, 10.08.2004. Sursa: Dicţionar ortografic  BLASTÉMĂ s.f. (bot.) 1. Mugure din care se va regenera un organ oarecare. 2. Talul unui lichen. [< fr. blastème, cf. gr. blastema – mugure] …   Dicționar Român

  • blastema — m. embriol. Masa de tejido embrionario formado por células indiferenciadas que dará lugar a un órgano determinado. Medical Dictionary. 2011. blastema …   Diccionario médico

  • blastema — (del gr. «blástēma») m. Biol. Conjunto de *células embrionarias que, mediante su proliferación, llegan a constituir cada uno de los tejidos orgánicos diferenciados. * * * blastema. (Del gr. βλάστημα, germen, retoño). m. Biol. Conjunto de células… …   Enciclopedia Universal

  • blastema — 1849, Modern Latin, from Gk. blastema offspring, offshoot, from stem of blastanein to shoot forth, from blastos sprout, germ, of unknown origin. Related: Blastemal …   Etymology dictionary

  • blastema — [blas tē′mə] n. pl. blastemas or blastemata [blas təmə tə] [ModL < Gr blastēma, a bud < blastanein, to bud < blastos, a sprout] the undifferentiated embryonic tissue from which cells, tissues, and organs are developed blastemic… …   English World dictionary

  • Blastema — Blas*te ma, n.; pl. {Blastemata}. [Gr. bla sthma bud, sprout.] (Biol.) The structureless, protoplasmic tissue of the embryo; the primitive basis of an organ yet unformed, from which it grows. [1913 Webster] …   The Collaborative International Dictionary of English

  • blastema — blastema. См. бластема. (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.

  • Blastēma — (gr, Keim, Sproß), 1) (Bot.), nach Richard die Keimpflanze, d.h. das Pflänzchen des Keimes für sich ohne Samenlappen; nach Wallroth das Lager der Flechten, also so v.w. Thallus; daher Blastematicus (Thallodes), zum Lager gehörend od. von ihm… …   Pierer's Universal-Lexikon

  • Blastema — Blastema, physiologischer Name derjenigen Theile der Thier und Pflanzensäfte, welche dem organischen Gewebe die zum Wachsthum nöthigen Stoffe liefern …   Herders Conversations-Lexikon

  • blastema — |ê| s. m. 1. Invólucro membranoso do embrião. 2. Eixo do desenvolvimento do embrião vegetal. 3. Substâncias amorfas que se derramam dentro ou à superfície de um tecido …   Dicionário da Língua Portuguesa

  • blastema — (Del gr. βλάστημα, germen, retoño). m. Biol. Conjunto de células embrionarias cuya proliferación conduce a la formación de un órgano determinado …   Diccionario de la lengua española

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