The myelin sheath around peripheral nerve fibres is produced by
- A. astrocytes
- B. microglia
- C. ependymal cells
- D. Schwann cells
Explanation
Schwann cells wrap themselves repeatedly around the axon, their membranes forming the insulating myelin. In the central nervous system the same job is done by oligodendrocytes, a distinction examiners like to test.
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