|Blastocyst with an inner cell mass and trophoblast.|
|Gives rise to||primitive yolk sac|
A blastocoel(e) or blastocele (also called blastocyst cavity, cleavage cavity or segmentation cavity) is the fluid-filled central region of a 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.
- "The Carnegie stages". Retrieved 2007-10-13.