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blastula
blastula The stage of development of an animal embryo that results from cleavage of a fertilized egg. This stage generally resembles a hollow ball with the dividing cells (blastomeres) of the embryo forming a layer (blastoderm) around a central cavity (blastocoel). In vertebrates the blastula forms a disc (blastodisc) on the surface of the yolk. In mammals the blastula stage is known as a blastocyst. See also gastrula.
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"blastula." A Dictionary of Biology. 2004. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>. "blastula." A Dictionary of Biology. 2004. Encyclopedia.com. (May 28, 2012). http://www.encyclopedia.com/doc/1O6-blastula.html "blastula." A Dictionary of Biology. 2004. Retrieved May 28, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O6-blastula.html |
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blastula
blastula Stage in the development of the embryo in animals. The blastula consists of a hollow cavity (blastocoel) surrounded by one or more spherical layers of cells. Commonly called the ‘hollow ball of cells’ stage, it occurs at or near the end of cleavage and precedes the gastrulation stage.
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"blastula." World Encyclopedia. 2005. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>. "blastula." World Encyclopedia. 2005. Encyclopedia.com. (May 28, 2012). http://www.encyclopedia.com/doc/1O142-blastula.html "blastula." World Encyclopedia. 2005. Retrieved May 28, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O142-blastula.html |
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blastula
blas·tu·la / ˈblaschələ/ • n. (pl. -las or -lae / -ˌlē/ ) Embryology an animal embryo at the early stage of development when it is a hollow ball of cells. |
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"blastula." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>. "blastula." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. (May 28, 2012). http://www.encyclopedia.com/doc/1O999-blastula.html "blastula." The Oxford Pocket Dictionary of Current English. 2009. Retrieved May 28, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O999-blastula.html |
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blastula
blastula An early embryonic stage of an animal, around the time of cleavage, that usually consists of a hollow sphere of cells. It is formed immediately prior to gastrulation.
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MICHAEL ALLABY. "blastula." A Dictionary of Zoology. 1999. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>. MICHAEL ALLABY. "blastula." A Dictionary of Zoology. 1999. Encyclopedia.com. (May 28, 2012). http://www.encyclopedia.com/doc/1O8-blastula.html MICHAEL ALLABY. "blastula." A Dictionary of Zoology. 1999. Retrieved May 28, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-blastula.html |
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blastula
blastula (blast-yoo-lă) n. an early stage of the embryonic development of many animals. The equivalent stage in mammals (including humans) is the blastocyst.
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"blastula." A Dictionary of Nursing. 2008. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>. "blastula." A Dictionary of Nursing. 2008. Encyclopedia.com. (May 28, 2012). http://www.encyclopedia.com/doc/1O62-blastula.html "blastula." A Dictionary of Nursing. 2008. Retrieved May 28, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O62-blastula.html |
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