(B) The medullary sheath (myelin sheath) is not continuous along the entire length of the nerve fibre.It is interrupted at regular intervals by gaps k

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(B) The medullary sheath (myelin sheath) is not continuous along the entire length of the nerve fibre.It is interrupted at regular intervals by gaps known as $Nodes \text{ of } Ranvier$.In these regions, the $Schwann$ cells are absent, which results in the discontinuity of the myelin sheath.