Blastula and Blastocyst
We define seven broad periods of embryogenesis--the zygote cleavage blastula gastrula segmentation pharyngula and hatching periods. Like the other two germ layers ie the mesoderm and endoderm the ectoderm forms shortly after fertilization after which rapid cell division begins. Image Result For Zygote Development Diagram Human Nursing Students Future Jobs The mammalian blastula is called a blastocyst and unlike the blastulas of other animal lineages the blastocyst has an inner cell mass and an outer cell layer called the. . It is termed Implantation. Human Reproduction Important Extra Questions Long Answer Type. The two-cell blastomere state present after the zygote first divides is considered the earliest mitotic product of the fertilized oocyte. The two-layered embryo implants into the uterine wall and by obtaining nutrients from the maternal blood starts to grow and develop. After attachment the uterine cells divide rap...