Term Name:	blastula
Synonyms:	blastosphere, blastula embryo
Definition:	Organism at the blastula stage - an early stage of embryonic development in animals. It is produced by cleavage of a fertilized ovum and consists of a spherical layer of around 128 cells surrounding a central fluid-filled cavity called the blastocoel. The blastula follows the morula and precedes the gastrula in the developmental sequence.
Ontology:	Cell Ontology [UBERON:0000307]