blastula


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Related to blastula: gastrulation, archenteron

blastula

 [blas´tu-lah] (pl. blas´tulae) (L.)
the usually spherical body produced by cleavage of a fertilized ovum (zygote), consisting of a single layer of cells (blastoderm) surrounding a fluid-filled cavity (blastocoele); it follows the morula stage.

blas·tu·la

(blas'tū-lă),
An early stage of an embryo formed by the rearrangement of the blastomeres of the morula to form a hollow sphere.
[G. blastos, germ]

blastula

/blas·tu·la/ (blas´tu-lah) pl. blas´tulae   [L.] the usually spherical structure produced by cleavage of a zygote, consisting of a single layer of cells (blastoderm) surrounding a fluid-filled cavity (blastocoele).

blastula

(blăs′chə-lə)
n. pl. blastu·las or blastu·lae (-lē′)
An early embryonic form produced by cleavage of a fertilized ovum and consisting of a spherical layer of cells surrounding a fluid-filled cavity. Also called blastosphere.

blas′tu·lar adj.
blas′tu·la′tion (-lā′shən) n.

blastula

[blas′tyələ]
Etymology: Gk, blastos, germ
an early stage of the process through which a zygote develops into an embryo, characterized by a fluid-filled sphere formed by a single layer of cells. The spheric layer of cells is called a blastoderm; the fluid-filled cavity is the blastocoele. The blastula develops from the morula stage and is usually the form in which the embryo becomes implanted in the wall of the uterus. Also called blastosphere.

blastula

A hollow sphere formed during the early embryonic development of higher animals—which follows the morular stage of embryogenesis—in which dividing cells line up on the outside and are bathed by fluid within the adjacent cavity (blastocoele). In animals where cleavage involves the whole egg, the blastula consists of a ball of cells with a hollow centre.

blas·tu·la

(blas'chŭ-lă)
An early stage of an embryo formed by the rearrangement of the blastomeres of the morula to form a hollow sphere.
[G. blastos, germ]
Blastulaclick for a larger image
Fig. 70 Blastula . Formulation of the blastula by cell cleavage.

blastula

or

blastophere

a stage in the development of an embryo, where the embryo consists of a hollow ball of cells with a central cavity (a MORULA) formed by a process of CLEAVAGE. Invagination (in-pushing of the ball at one side) of cells into the blastula gives rise to the GASTRULA. See ARCHENTERON (Fig. 44).

blastula

the usually spherical body produced by cleavage of a fertilized ovum, consisting of a single layer of cells (blastoderm) surrounding a fluid-filled cavity (blastocoele); it follows the morula stage.
References in periodicals archive ?
Normally, cortical rotation activates the Nieuwkoop center of the vegetal hemisphere, which will thereafter in the blastula induce the formation of the Spemann organizer region in the marginal zone.
marmoratus embryos (cleavage to early blastula stage) to various concentrations of hygromycin B.
Aunque la analogia del aborto con el asesinato sea descartable, parece necesario distinguir, por mor del concepto de persona utilizado por el autor, una blastula o embrion de un feto que ya lleva dos o tres meses de desarrollo; por lo tanto, este embrion o feto ya es "concebido", de manera que la analogia con la anticoncepcion tiene una aplicacion restringida.
A tecnica desenvolvida por pesquisadores norteamericanos de extrair celulas-tronco embrionarias humanas de morulas, fase onde o embriao apresenta entre 8 a 16 celulas e nao de blastulas, um estagio de 100 celulas, como eles fazem normalmente, se mostra assim promissora.
there are individuals who believe that such takes place prior to the blastula stage and much stem-cell research, therefore, constitutes an insult to their beliefs.
In this context the (almost) anaerobic metabolism at blastula stage embryo could reflect the existence of multi-cellular organisms in the deep anoxic Earth while the transition to aerobic metabolism at gastrula could be related to the evolution towards tridermic organisms around 2 billion years ago.
Previamente, esto solo podia lograrse durante la etapa llamada blastula, a la cual se llega tras 6 dias de desarrollo.
carcinus, lograron sobrepasar la etapa de blastula y obtener huevos en fase de gastrulacion, los que murieron despues de la formacion del blastoporo.
The first observation was of the early blastula, which was located at the animal pole.
4 mM del pesticida alteran la formacion del disco embrionario al estado de blastula resultando en una gastrulacion anormal y detencion posterior del desarrollo.
Additionally, half the subjects were treated from blastula stage to hatching only, while the second half were treated beginning at hatching for the duration of the experiment.