blastula The stage of development of an animal embryo that results from cleavage of a fertilized egg. This stage generally resembles a hollow ball with the dividing cells (blastomeres) of the embryo forming a layer (blastoderm) around a central cavity (blastocoel). In vertebrates the blastula forms a disc (blastodisc) on the surface of the yolk. In mammals the blastula stage is known as a blastocyst. See also gastrula.
blas·tu·la / ˈblaschələ/ • n. (pl. -las or -lae / -ˌlē/ ) Embryology an animal embryo at the early stage of development when it is a hollow ball of cells.
blastula Stage in the development of the embryo in animals. The blastula consists of a hollow cavity (blastocoel) surrounded by one or more spherical layers of cells. Commonly called the ‘hollow ball of cells’ stage, it occurs at or near the end of cleavage and precedes the gastrulation stage.
More From encyclopedia.com
Gastrulation , gastrulation In the embryogenesis of a vertebrate, the next stage after the blastula, in which the three germ layers differentiate to form the triplo… Germ Layers , germ layers (primary germ layers) The layers of cells in an animal embryo at the gastrula stage, from which are derived the various organs of the ani… Embryonic Development , All embryonic structures are derived from a single cell formed by the union of two gametes. Every individual organism began as a single cell, which d… Metamorphosis , Metamorphosis, or a change in form, in biology means the transition from a larval stage to an adult stage. In most animals, embryonic development lea… Stage , Stage (or Phase) The term "stage" is used to designate a developmental phase that, for Freud, is characterized by a specific organization of the libi… Dinophyceae , Dinophyceae A class of Pyrrophyta, comprising algae that are unicellular and have two flagella (thread-like structures) of unequal length. Most dinof…
About this article
All Sources -
Updated About encyclopedia.com content Print Topic
You Might Also Like