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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

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]
Farlex Partner Medical Dictionary © Farlex 2012

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.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

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.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

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]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
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).
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005