Thei internal cavity commonly formed by ell division prior to gastrulation is the

Options

A. Enteron
B. Blastopore
C. Blastocoel
D. Coelom

Explanation

**Step-by-Step Text Solution:**

1. **Understanding Fertilization**: After fertilization occurs in the ampullary region of the fallopian tube, the zygote begins to undergo cell division.

2. **Cell Division Process**: The zygote divides through mitosis, first forming a two-cell stage, then progressing to a four-cell stage, and continuing to divide until it reaches an eight-cell stage, and subsequently a sixteen-cell stage.

3. **Formation of the Blastocyst**: Once the cell division reaches the sixteen-cell stage, the structure is referred to as a blastocyst. As cell division continues, it forms a more complex structure with an outer layer and an inner mass.

4. **Components of the Blastocyst**: The blastocyst consists of two main parts:
- **Trophoblast**: The outer layer of cells that will eventually contribute to the placenta and provide nutrition to the developing embryo.
- **Inner Cell Mass**: A group of cells inside the blastocyst that will develop into the embryo itself and give rise to the three germ layers: ectoderm, mesoderm, and endoderm.

5. **Identification of the Internal Cavity**: The internal cavity formed during this stage is known as the **blastocele**. This cavity is crucial for the development of the embryo as it allows for nutrient exchange and the growth of the inner cell mass.

6. **Conclusion**: Therefore, the internal cavity commonly formed by cell division prior to gastrulation is called the **blastocele**.

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