NEET 2017 · BiologyPrevious Year Question
Myelin sheath is produced by
Answer: (A) Schwann Cells and Oligodendrocytes. Answer: (a) Schwann Cells and Oligodendrocytes.
- A.Schwann Cells and Oligodendrocytes✓
- B.Astrocytes and Schwann Cells
- C.Oligodendrocytes and Osteoclasts
- D.Osteoclasts and Astrocytes
Correct Answer
(A) Schwann Cells and Oligodendrocytes
Solution & Explanation
Answer: (a) Schwann Cells and Oligodendrocytes. Solution: In myelinated nerve fibres the axon is enveloped with Schwann cells, which form a myelin sheath around the axon. In the peripheral nervous system the myelin is made by Schwann cells, while in the CNS it is produced by oligodendrocytes (extension content) — hence both cell types make myelin. NCERT directly names Schwann cells as forming the myelin sheath. NCERT Reference: Ch 18, p.232, lines 18-19 — "The myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath"
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