A fluid-filled cavity forms inside the morula. This cavity is known as the blastocyst cavity or blastocoele, and the morula is now called a blastula or blastocyst. The inner cell mass is now known as the embryoblast and the outer cell mass becomes the trophoblast.
Figure 8. Schematic diagrams of sectioned blastocysts. a. A human blastocyst at about 4, 5 days of development. b. A monkey blastocyst at about 9 days of development. c. A human blastocyst at 14 days of development
Human cleavage is called:
-complete
-asynchronous
-nearly equal
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