In the central nervous system, the myelin sheath around the nerve fiber is formed by the spiral wrapping of
(a) Neurilemma
(b) Schwann cells
(c) Oligodendrocytes
(d) Neurolemmocytes

Options

A. Neurilemma
B. Schwann cells
C. Oligodendrocytes
D. Neurolemmocytes

Answer

To solve the question regarding the formation of the myelin sheath around nerve fibers in the central nervous system, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks which type of cell forms the myelin sheath around nerve fibers specifically in the central nervous system (CNS).

2. **Identify the Options**: The options provided are:
- (a) Neurilemma
- (b) Schwann cells
- (c) Oligodendrocytes
- (d) Neurolemmocytes

3. **Recall the Functions of Each Cell Type**:
- **Neurilemma**: This is a membrane that surrounds the axons of peripheral nerves but is not a type of cell that forms myelin in the CNS.
- **Schwann Cells**: These cells are responsible for forming the myelin sheath in the peripheral nervous system (PNS), not in the CNS.
- **Oligodendrocytes**: These are glial cells found in the CNS that wrap around axons to form the myelin sheath.
- **Neurolemmocytes**: This is another term for Schwann cells, which again are not involved in the CNS.

4. **Determine the Correct Answer**: Based on the information recalled, oligodendrocytes are the cells that form the myelin sheath in the central nervous system. Therefore, the correct answer is (c) Oligodendrocytes.

5. **Conclusion**: The myelin sheath around the nerve fiber in the central nervous system is formed by the spiral wrapping of oligodendrocytes.

### Final Answer:
(c) Oligodendrocytes