Blastula is formed from ____ through cleavage. Blastula consist of a ____ spherical mass of cell comprising ____ and inner cell mass. The fluid-filled central cavity is known as ____. Blastula cells are called ____. Blastula attaches /implants to the endometrium / uterine wall usually about seven days / one week after fertilization Blastula/ Blastocyst obtains nourishment through the ____. Cells within the inner cell mass migrate from amniotic cavity. The lower layer of inner cell mass forms the ____ and ectoderm. ____ develops in between the endoderm and ectoderm . Blastocyst develops into ____, the process known as gastrulation.

Discuss the human embryo development from blastula to gastrula stage.

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