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Related to blastocoele: primitive streak
blas·to·coelor blas·to·coele (blăs′tə-sēl′)
The fluid-filled, central cavity of a blastula. Also called segmentation cavity.
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|Noun||1.||blastocoele - the fluid-filled cavity inside a blastula|
blastosphere, blastula - early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs