(blas-tyoo-la) [Gk. blastos, sprout] The hollow ball of cells marking the end stage of cleavage during early embryonic development.

embryonic state, 1875, Modern Latin, from Greek blastos "sprout, germ" + diminutive ending -ula (see -ule).

(blas´tyoo-lua) An early stage of prenatal development between the morula and embryonic period. blood

n. in embryology, refers to a single layer of cells formed after cleavage of the zygote or fertilized egg. Spherical in form, this cell layer (blastoderm) surrounds a fluid-filled cavity (blastocoele) [..]

A group of cells with a rough spherical shape formed by cell division.

(n) early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization) implant [..]

An early embryonic form produced by cleavage of a fertilized ovum and usually consisting of a single layer of cells surrounding a fluid-filled spherical cavity.

An early Non-Mammalian Embryo that follows the Morula stage. A blastula resembles a hollow ball with the layer of Cells surrounding a fluid-filled cavity (blastocele). The layer of Cells is called Bla [..]

An early non-mammalian embryo (EMBRYO, NONMAMMALIAN) that follows the MORULA stage. Blastula is usually a spherical structure containing a single layer of cells with a hollow cavity.

hollow sphere of cells produced during the development of an embryo by repeated cleavage of a fertilized egg bluegreen

An early developmental stage of vertebrate embryos formed by cleavage of the fertilized egg, in which the embryo consists of a single layer of cells surrounding a cavity (the blastocoel).

the stage of an embryo before gastrulation