The trophoblast cells are not involved in the formation of

Options

A. chorionic villi
B. protective and trophic membrane
C. vital organs of the embryo
D. fetal portion of placenta

Answer

To solve the question regarding the involvement of trophoblast cells in the formation of various structures, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Trophoblast Cells**:
- Trophoblast cells are the outer layer of the blastocyst. Their primary function is to provide nutrients to the embryo and to develop into a significant part of the placenta.

2. **Analyze the Options**:
- We need to determine which option does not involve trophoblast cells in its formation. The options provided are:
- A) Chorionic villi
- B) Protective amniotic membranes
- C) Vital organs of the embryo
- D) Fetal portion of the placenta

3. **Evaluate Each Option**:
- **Option A: Chorionic Villi**:
- Trophoblast cells contribute to the formation of chorionic villi, which are essential for nutrient exchange between the mother and the fetus.
- **Option B: Protective Amniotic Membranes**:
- These membranes separate maternal blood from fetal blood and are also associated with trophoblast cells.
- **Option C: Vital Organs of the Embryo**:
- Trophoblast cells do not form vital organs such as the heart, lungs, or kidneys. This option is likely the correct answer.
- **Option D: Fetal Portion of the Placenta**:
- Trophoblast cells are involved in forming the fetal portion of the placenta, so this option is incorrect.

4. **Conclusion**:
- Based on the analysis, the trophoblast cells are **not involved** in the formation of **vital organs of the embryo**. Therefore, the correct answer is **Option C**.