Blastula

The embryonic stage of development when the cells form a single-layered hollow sphere.


The first stage of the development of an embryo in animals.


Ball-like, one cell-layer-thick stage of development of an embryo.


An early stage of the embryonic development of many animals. The equivalent stage in mammals (including man) is the blastocyst.


An early stage in the development of a zygote into an embryo; it consists of a hollow sphere of cells enclosing a cavity, the blastocele. In large-yolked eggs, the blastocele is reduced to a narrow slit. In mammalian development, the blastocyst corresponds to the blastula of lower forms.


 

 


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