Myelin sheath is produced by
or
Mylin of the nerve fibres of the central nervous system is produced and maintained by

Options

A. Schwarm cell and Oligodendrocytes
B. Astrocytes and Schwarm cells
C. Oligodendrocytes and Osteoclasts
D. Osteoclasts and Astrocytes

Explanation

### Step-by-Step Solution:

1. **Understanding Myelin Sheath**:
- The myelin sheath is an insulating layer that surrounds nerve fibers. It is crucial for the proper functioning of the nervous system as it helps in the rapid transmission of electrical signals along the nerve cells.

2. **Identifying the Cells Involved**:
- Myelin sheath is produced by specific types of cells. In the peripheral nervous system (PNS), myelin is produced by Schwann cells. In the central nervous system (CNS), it is produced by oligodendrocytes.

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