What is medullary sheath ? mention it's significance.
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A medullary sheath is a protective covering surrounding and insulating certain nerve fibres. Medullary sheath is further composed of two layers; an inner fatty layer called the myelin sheath and an outside cellular layer called the neurilemma or sheath of Schwann cells. It helps in stimulating the nerve transmission.
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A medullary sheath is a protective covering surrounding and insulating certain nerve fibres. . It helps in stimulating the nerve transmission. It acts as an electrical insulator and allows faster and more energetically efficient conduction of nerve impulse
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