A group of neurons in PNS, CNS respectively are  

Options

A. nuclei, ganglion
B. ganglion, nucleus
C. connectives, commissures
D. commissures, connectives

Answer

To answer the question regarding the terminology used for a group of neurons in the Peripheral Nervous System (PNS) and Central Nervous System (CNS), we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Terms**:
- The PNS stands for Peripheral Nervous System, which includes all the nerves outside the brain and spinal cord.
- The CNS stands for Central Nervous System, which comprises the brain and spinal cord.

2. **Identifying Groups of Neurons**:
- In the **PNS**, a group of neurons is referred to as a **ganglion**. This is a cluster of nerve cell bodies.
- In the **CNS**, a group of neurons is called a **nucleus**. This refers to a collection of neuronal cell bodies within the brain or spinal cord.

3. **Conclusion**:
- Therefore, the answer to the question is:
- In the PNS, a group of neurons is called a **ganglion**.
- In the CNS, a group of neurons is called a **nucleus**.

### Final Answer:
- **PNS**: Ganglion
- **CNS**: Nucleus

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