Blastulation is the stage in early animal embryonic development that produces the blastula. In mammalian development, a blastula develops into the blastocyst with a differentiated inner cell mass …

blastula, hollow sphere of cells, or blastomeres, produced during the development of an embryo by repeated cleavage of a fertilized egg. The cells of the blastula form an epithelial (covering) layer, …

After the cleavage has produced over 100 cells, the embryo is called a blastula. The blastula is usually a spherical layer of cells (the blastoderm) surrounding a fluid-filled or yolk-filled cavity (the blastocoel).

Jul 1, 2026 · The meaning of BLASTULA is an early metazoan embryo typically having the form of a hollow fluid-filled rounded cavity bounded by a single layer of cells.

Mar 15, 2026 · In most animals, the blastula consists of an outer layer of cells surrounding a fluid-filled cavity. After a sperm fertilizes an egg, the resulting single cell (the zygote) begins dividing rapidly in a …

The blastula is the first identifiable stage of early embryo development that is common to many animals, and consists generally of a hollow epithelial layer enclosing a fluid-filled cavity: the blastocoel.

Mar 31, 2023 · Biology definition: A blastula is an early embryonic stage in various animal species that forms via cell division and differentiation post-fertilization. It has a hollow, spherical shape containing …

Gastrulation is the stage in the early embryonic development of most animals, during which the blastula (a single-layered hollow sphere of cells), or in mammals, the blastocyst, is reorganized into a two …

A blastula is an early stage of embryonic development formed after cleavage, consisting of a hollow ball of cells. It develops from the zygote through repeated mitotic divisions called cleavage.

Sep 14, 2025 · In this video, we explain Blastula — an early stage of embryonic development in animals that forms after the fertilized egg divides multiple times. You’ll learn the definition, meaning,...