Question

what is myelin sheath?​

Answer 1

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The insulating envelope of myelin that surrounds the core of a nerve fiber or axon and that facilitates the transmission of nerve impulses, formed from the cell membrane of the Schwann cell in the peripheral nervous system and from oligodendroglia cells.medullary sheath

In short

a wrapping of myelin around certain nerve axons, serving as an electrical insulator that speeds nerve impulses to muscles and other effectors.

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Answer 2

Answer:

Myelin Sheath:-

Myelin Sheath or Medullary sheath is a protectory cover of Neuron specially the part Axon . The sheath is a composition of proteins , fats and other components which make it hard and tough enough to provide protection to the Axon from sudden shock or any other disturbance in carrying electrical impulses from Cell Body to Dendrites.