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Blastocyst - 2.png
Blastocyst English.svg
Blastocyst with an inner cell mass and trophoblast.
Carnegie stage 3
Days 5
Precursor morula
Gives rise to primitive yolk sac

A blastocoel(e) or blastocele (also called blastocyst cavity,[1] cleavage cavity or segmentation cavity) is the fluid-filled central region of a blastula and mammalian blastocyst. A blastocoele forms during embryogenesis when a zygote (a fertilized ovum) divides into many cells through mitosis.

The adjectival of "blastocoel(e)" is blastocoelic.

A blastocoel can be described as the first cell cavity formed as the embryo enlarges. It is essential for later gastrulation.


  1. ^ "The Carnegie stages". Retrieved 2007-10-13. 

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