- the early developmental stage of an animal, following the morula stage and consisting of a single, spherical layer of cells enclosing a hollow, central cavity.
Origin of blastula
Examples from the Web for blastula
Historical Examples of blastula
The round cluster becomes filled with fluid, and we have a hollow sphere of cells, which I call the blastula.
The hollow sphere which is thus formed is the important stage of the “germinal vesicle,” the blastula, or blastosphere.
Consider its mode of division, and the formation of the blastula, gastrula, and germinal layers.The Biological Problem of To-day
In a blastula showing complete segmentation the blastomeres of the upper hemisphere are the more finely subdivided.A Guide to the Study of Fishes, Volume 1 (of 2)
David Starr Jordan
Our next question concerns the distribution of potentiality, when the embryo is developed further than the blastula stage.
- an early form of an animal embryo that develops from a morula, consisting of a sphere of cells with a central cavityAlso called: blastosphere
Word Origin for blastula
embryonic state, 1875, Modern Latin, from Greek blastos "sprout, germ" + diminutive ending -ula.
- An early embryonic form produced by cleavage of a fertilized ovum and consisting of a spherical layer of cells surrounding a fluid-filled cavity.
- An animal embryo at the stage immediately following the division of the fertilized egg cell, consisting of a ball-shaped layer of cells around a fluid-filled cavity known as a blastocoel. Compare gastrula. See also blastocyst.