Question

Myelin sheath is produced by

• A. Astrocytes and Schwann cells
• B. Oligodendrocytes and Osteoclasts
• C. Osteoclasts and Astrocytes
• D. Schwann cells and Oligodendrocytes

Answer 1

The Correct Option is D

The myelin sheath is a crucial component of the nervous system, essential for the proper functioning of neurons. It acts as an insulating layer that surrounds nerves, including those in the brain and the spinal cord. This sheath allows electrical impulses to transmit quickly and efficiently along the nerve cells.

Now, let's examine the options given in the question to identify which cells are responsible for producing the myelin sheath:

1. Astrocytes and Schwann cells: Astrocytes are a type of glial cell that supports and nurtures neurons but do not produce myelin. Schwann cells, however, are responsible for producing the myelin sheath for peripheral nervous system neurons.
2. Oligodendrocytes and Osteoclasts: Oligodendrocytes are the cells in the central nervous system that produce myelin. Osteoclasts are involved in bone resorption and have no role in the nervous system's myelination.
3. Osteoclasts and Astrocytes: Neither osteoclasts nor astrocytes produce myelin, thus making this option incorrect.
4. Schwann cells and Oligodendrocytes: Schwann cells produce myelin in the peripheral nervous system, while oligodendrocytes are responsible for myelin production in the central nervous system. Therefore, both these cells are involved in the formation of the myelin sheath in different parts of the nervous system.

From the above analysis, the correct answer is: Schwann cells and Oligodendrocytes.

In conclusion, Schwann cells and oligodendrocytes are responsible for the formation of the myelin sheath, crucial for neural signaling efficiency. This knowledge is foundational for understanding how nerve cells function and communicate.