Myelin sheath covers

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(B) The myelin sheath,also known as the medullary sheath,is a lipid-rich layer that surrounds the axons of many neurons. It acts as an insulating laye

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Nerve fibre

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(B) The myelin sheath,also known as the medullary sheath,is a lipid-rich layer that surrounds the axons of many neurons. It acts as an insulating layer that increases the speed of electrical impulses along the nerve fibres. In the $CNS$ (Central Nervous System),myelin is produced by oligodendrocytes,while in the $PNS$ (Peripheral Nervous System),it is produced by Schwann cells. Therefore,the correct answer is $B$.

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