An aggregation of nerve cell bodies inside the CNS (central nervous system) is typically called a

Options

A. colony
B. nissl zone
C. clone
D. nuclei

Explanation

To solve the question "An aggregation of nerve cell bodies inside the CNS (central nervous system) is typically called a", we will analyze the provided options step by step.

### Step-by-Step Solution:

1. **Understanding the Question**:
- We need to identify the correct term that describes a collection of nerve cell bodies within the central nervous system (CNS).

2. **Analyzing the Options**:
- **Option A: Colony**
- A colony refers to a group of organisms of the same species living together, often used in the context of bacteria or social insects. This term does not apply to nerve cell bodies in the CNS.
- **Conclusion**: This option is incorrect.

- **Option B: Nissl Zone**
- The Nissl zone refers to areas in the neuron where Nissl bodies (rough endoplasmic reticulum and ribosomes) are concentrated. While it is related to the structure of neurons, it does not specifically refer to an aggregation of nerve cell bodies.
- **Conclusion**: This option is incorrect.

- **Option C: Clone**
- A clone is a group of genetically identical organisms. This term is not relevant to the aggregation of nerve cell bodies in the CNS.
- **Conclusion**: This option is incorrect.

- **Option D: Nuclei**
- In the context of the nervous system, "nuclei" refers to clusters or aggregations of nerve cell bodies within the CNS. This is the correct biological term for such an aggregation.
- **Conclusion**: This option is correct.

3. **Final Answer**:
- The correct term for an aggregation of nerve cell bodies inside the CNS is **nuclei** (Option D).