What is the covering of nerve fascicule called?

Answer

To answer the question "What is the covering of nerve fascicules called?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Nerve Fascicules**:
- Nerve fascicules are bundles of axons, which are the long projections of nerve cells (neurons) that transmit signals. These fascicules play a crucial role in the nervous system, particularly in the brain and peripheral nerves.

2. **Identifying the Covering**:
- Each nerve fascicule is surrounded by a protective covering. This covering is essential for the protection and support of the axons within the fascicule.

3. **Naming the Covering**:
- The specific name for the covering of nerve fascicules is "endoneurium". This is a type of connective tissue that forms a delicate layer around each individual axon within the fascicule.

4. **Function of the Endoneurium**:
- The endoneurium serves several important functions, including providing structural support, protecting the axons, and facilitating the transmission of signals by insulating the axons, especially in myelinated fibers.

5. **Conclusion**:
- Therefore, the covering of nerve fascicules is called the **endoneurium**.