Trophoblast is not involved in the formation of

Options

A. Protective and trophic membranes
B. Foetal portion of placenta
C. Body of developing embryo
D. Chorionic villi

Explanation

**Step-by-Step Solution:**

1. **Understanding Trophoblast**: The trophoblast is the outer layer of the blastocyst, which is a structure formed in the early stages of embryonic development. It plays a crucial role in the implantation of the embryo into the uterine wall.

2. **Functions of Trophoblast**: The trophoblast has several important functions:
- It forms the outer protective layer of the blastocyst.
- It contributes to the formation of the placenta, specifically the fetal portion of the placenta.
- It helps in the formation of chorionic villi, which are essential for nutrient exchange between the mother and the developing embryo.

3. **Analyzing the Options**:
- **Option A: Protective anthropic membranes**: Trophoblast is involved in the formation of protective membranes, so this option is incorrect.
- **Option B: Fetal portion of placenta**: Trophoblast is indeed involved in forming the fetal portion of the placenta, so this option is also incorrect.
- **Option C: Body of developing embryo**: Trophoblast does not contribute to the formation of the body of the developing embryo. This option is correct as it states what trophoblast is not involved in.
- **Option D: Chorionic villi**: Trophoblast is responsible for forming chorionic villi, making this option incorrect.

4. **Conclusion**: The correct answer to the question "Trophoblast is not involved in the formation of" is **C. Body of developing embryo**.

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