blastula

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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).