Immediately after implantaion, ectoderm, endoderm and the mesoderm of embryo is formed from .

Options

A. Trophoblast
B. Cytotrophoblast
C. Embryoblast
D. Syncytiotrophoblast

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the formation of the three primary germ layers (ectoderm, endoderm, and mesoderm) immediately after implantation of the embryo.

2. **Identifying Key Terms**: The terms "ectoderm," "endoderm," and "mesoderm" refer to the three primary layers of cells that form during embryonic development. The question also provides four options: trophoblast, cytotrophoblast, embryoblast, and syncytiotrophoblast.

3. **Explaining Trophoblast**: The trophoblast is the outer layer of the blastocyst that plays a crucial role in implantation and the formation of the placenta. It is derived from the blastocyst and is involved in the initial stages of embryo development.

4. **Role of Trophoblast in Germ Layer Formation**: The trophoblast is responsible for the formation of the germ layers, which include the ectoderm, endoderm, and mesoderm. These layers will eventually differentiate into various tissues and organs of the body.

5. **Conclusion**: Based on the information provided, the correct answer to the question is that the ectoderm, endoderm, and mesoderm of the embryo are formed from the trophoblast.

**Final Answer**: The ectoderm, endoderm, and mesoderm of the embryo are formed from the trophoblast.

---