Notochord grows from

Options

A. Neuropore
B. Prechordal plate
C. Hypochordal rod
D. Chorda-mesoderm.

Answer

**Step-by-Step Solution:**

1. **Understanding the Notochord**: The notochord is a flexible rod-like structure that is essential in the development of the vertebrate embryo. It serves as a primary skeletal element and plays a crucial role in the development of the nervous system.

2. **Origin of the Notochord**: The notochord is derived from mesodermal tissue. During embryonic development, specifically during the process of gastrulation, the mesoderm is formed.

3. **Identifying the Correct Option**: The question provides four options regarding the origin of the notochord:
- A. Neuroport
- B. Pericordial Plate
- C. Hypercordial Rod
- D. Corda Mesodum

4. **Analyzing Each Option**:
- **Neuroport**: This term is not directly related to the formation of the notochord.
- **Pericordial Plate**: This structure is associated with the heart and does not give rise to the notochord.
- **Hypercordial Rod**: This is not a recognized structure in embryonic development.
- **Corda Mesodum**: This is a term that refers to the mesodermal origin of the notochord.

5. **Conclusion**: Based on the analysis, the notochord grows from the "Corda Mesodum," which is option D.

**Final Answer**: D. Corda Mesodum

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