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

(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

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).
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.
In addition, embryos (20/replicate) were exposed during cleavage (0.75-2 hpf), blastula (2.25-5 hpf), gastrula (5.25-10 hpf), segmentation (10-24 hpf), or pharyngula (24-48 hpf) alone in triplicate glass beakers, and incubated in vehicle control media (0.1% DMSO) pre-and postexposure until 96 hpf.
Ingestion of these plants during gestation may cause anomalies in foetus (Jones, 1983) it is believed that embryo is injured during blastula and gastrula stages of development.
Nas fases de morula e blastula, apresentaram uma tendencia ao decrescimo em suas concentracoes, sugerindo que a presenca de ambos no embriao e de origem materna e pode estar envolvida na MZT.
Kryptolebias marmoratus embryos were tested for susceptibility to hygromycin B under various concentrations prior to the late blastula stage of development.
77) o no podemos ser crueles con una blastula, pero si podemos serlo con un feto de seis meses (p.
The present decade saw the emergence of the "morulas," works made of many layers of fabrics, reproducing the image of masses of cells resulting from the cleavage of the ovum before the formation of a blastula. In this period, Catunda began using personal images by silk-screening them onto fabric, with portraits of friends and family such as Todo o Pessoal (All the People), 2006, and Todo o Pessoal II, 2008.
A medida que la segmentacion progresa la capa epitelial engloba el blastocele, y el embrion se convierte en una esfera hueca formandose la BLASTULA (Figura 5).
"Aunque estadios de un mismo organismo, un zigoto no es una blastula, y un embrion no es un human.
Las celulas resultantes de dicha division se denominan blastomeros y forman una masa compacta llamada morula, a partir de la cual se forma la blastula y posteriormente la gastrula.