ANATOMY

Detailed explanation-1: -blastula, hollow sphere of cells, or blastomeres, produced during the development of an embryo by repeated cleavage of a fertilized egg. The cells of the blastula form an epithelial (covering) layer, called the blastoderm, enclosing a fluid-filled cavity, the blastocoel.

Detailed explanation-2: -Around the time the morula enters the uterus, it becomes known as a blastocyst and develops a cystic cavity known as a blastocele. By this time, the inner and outer cell masses have formed, which give rise to the embryo proper and the placenta respectively.

Detailed explanation-3: -The blastocoel (/ˈblæstəˌsiːl/), also spelled blastocoele and blastocele, and also called cleavage cavity, or segmentation cavity is a fluid-filled or yolk-filled cavity that forms in the blastula during very early embryonic development.

Detailed explanation-4: -The blastocoel is a fluid-filled cavity characteristic of animal embryos at the blastula stage. Its emergence is commonly described as the result of cleavage patterning, but this historical view conceals a large diversity of mechanisms and overlooks many unsolved questions from a biophysics perspective.

Detailed explanation-5: -Upon blastocoel formation, the embryo is known as the blastula; the cells of blastula then become differentiated and specialized to form the blastocyst. The blastocoel is also known as the blastocyst cavity.