Groups of axons in CNS & PNS respectively are called 

Options

A. axons, dendrites
B. telodendrons, dendrites
C. tracts, dendron
D. tracts, nerves

Answer

To answer the question about the groups of axons in the Central Nervous System (CNS) and Peripheral Nervous System (PNS), we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Axons**:
- Axons are long, slender projections of neurons that transmit electrical impulses away from the neuron's cell body. They are often referred to as nerve fibers.

2. **Identifying Groups of Axons**:
- In the context of the nervous system, axons can be grouped together. The terminology for these groups differs between the CNS and PNS.

3. **CNS Terminology**:
- In the Central Nervous System (CNS), a group of axons is called a **tract**. Tracts are bundles of axons that run together in the brain and spinal cord.

4. **PNS Terminology**:
- In the Peripheral Nervous System (PNS), a group of axons is referred to as a **nerve**. Nerves are the peripheral counterparts to tracts and carry signals to and from the CNS.

5. **Final Answer**:
- Therefore, the correct answer to the question is that in the CNS, groups of axons are called **tracts**, and in the PNS, they are called **nerves**.

### Conclusion:
The answer to the question is:
- In the CNS: **Tracts**
- In the PNS: **Nerves**