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Results for: 'yolk sac'

Fertilization Animation

By: Administrator, Views: 193

At conception, the gender and other biologic traits of the new individual are determined. The zygote is genetically complete and immediately begins to divide, forming a solid mass of cells called a morula. When the developing embryo (stage of development between weeks 2 and 8) reaches the ute...

Cleavage and Implantation Animation

By: HWC, Views: 251

✔ ✔ ✔ Ask questions here: Follow us: ▶ Facebook: ▶ Review Us: Fertilization typically takes pl...

Embryonic development - week 1 and 2

By: HWC, Views: 3073

The first through eighth weeks after fertilization are called the embryonic. Week 1 • Within a day, the zygote begins mitotic cell division (cleavage) forming blastomeres. By the 4th day, the blastomeres have formed a solid ball called a morula. • The morula enters uterine cavity ar...

Gastrulation: cross section of the frog

By: HWC, Views: 1943

Gastrulation Most animals enter a phase early in development called gastrulation. In this phase, a tiny ball or disc of cells rearranges to form three embryonic layers of tissue, called germ layers. The germ layers of the embryo—now called a gastrula—are called the endoderm, mesoderm, and eco...