Which one occurs first in embryo

Options

A. Neurogenesis
B. Notogenesis
C. Heptogenesis
D. Cardiogenesis.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks which developmental process occurs first in the embryo. We need to identify the correct process among the options provided.

2. **Identifying Key Processes**: The key processes mentioned in the video transcript are:
- Neurogenesis
- Notogenesis
- Haptogenesis
- Cardiogenesis

3. **Defining Each Process**:
- **Neurogenesis**: This is the process of forming the neural tube and is associated with the development of the nervous system.
- **Notogenesis**: This refers to the formation of the notochord, which is important for the development of the vertebral column.
- **Haptogenesis**: This is the formation of the liver during embryonic development.
- **Cardiogenesis**: This is the formation of the heart.

4. **Determining the Sequence**: According to the transcript, neurogenesis occurs first during embryonic development. The ectoderm, which is the outermost germ layer, invaginates to form the neural tube, leading to neurogenesis.

5. **Conclusion**: Based on the information, the correct answer to the question is **neurogenesis**, as it is the first process to occur in the embryo.

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