Which is not part of nervous system?

Options

A. Cyton
B. Axon
C. Myelin
D. Intermedin.

Answer

To answer the question "Which is not part of the nervous system?" we will analyze each option provided.

### Step-by-Step Solution:

1. **Understanding the Nervous System**: The nervous system is made up of neurons, which are the basic structural and functional units. Neurons consist of a cell body (cyton), axons, and dendrites.

2. **Analyzing the Options**:
- **Cyton**: This is the cell body of a neuron and is definitely a part of the nervous system.
- **Axon**: This is a long projection of a neuron that transmits impulses away from the cell body. It is also a part of the nervous system.
- **Myelin**: This refers to the myelin sheath, a protective covering that surrounds axons in many neurons, facilitating faster transmission of nerve impulses. It is part of the nervous system.
- **Intermedine**: This is a hormone produced by the intermediate lobe of the pituitary gland, known as melanocyte-stimulating hormone in certain vertebrates. It is not related to the structure or function of the nervous system.

3. **Conclusion**: Based on the analysis, the correct answer to the question is **Intermedine**, as it is not a part of the nervous system.

### Final Answer:
**Intermedine** is not part of the nervous system.