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| blastula (an early embryonic form produced by cleavage of a fertilized ovum and consisting of a spherical layer of cells surrounding a fluid-filled cavity) | |||
| blastocyst | |||
| germ bladder | |||
| blastula | |||
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| bubble nucleus | |||
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| blastula (an early embryonic form produced by cleavage of a fertilized ovum and consisting of a spherical layer of cells surrounding a fluid-filled cavity) | |||
| blastocyst | |||
| germ bladder | |||
| blastula | |||
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| bubble nucleus | |||