Which type of cells form the myelin sheaths around axons?a) Schwann cellsb) Astrocytesc) Adjacent nerve cellsd) Muscle cells

1. Identify the Question

The question is asking about the type of cells that are responsible for forming the myelin sheaths around axons in the nervous system.

2. Analyze the Options

• a) Schwann cells: These are glial cells in the peripheral nervous system that wrap around axons to form the myelin sheath.
• b) Astrocytes: These are glial cells in the central nervous system that provide support and nutrition to neurons but do not form myelin sheaths.
• c) Adjacent nerve cells: This is a vague description, as nerve cells (neurons) do not form myelin; they have myelin sheaths formed by glial cells.
• d) Muscle cells: These are unrelated to myelination; they are responsible for contraction and movement and do not form myelin sheaths.

3. Conclusion

Given the definitions and roles of these cells, the only correct answer is:

Final Answer

a) Schwann cells