Myelin sheath is a layer covering

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(D) The myelin sheath is a lipid-rich insulating layer that surrounds the axons of many neurons in the vertebrate nervous system.It is formed by Schwa

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$A$ nerve fibre in a vertebrate

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(D) The myelin sheath is a lipid-rich insulating layer that surrounds the axons of many neurons in the vertebrate nervous system.It is formed by Schwann cells in the peripheral nervous system and by oligodendrocytes in the central nervous system.This sheath increases the speed of electrical impulses along the nerve fibre.Therefore,it is a characteristic feature of vertebrate nerve fibres.

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