Q.
Which of the following statement is correct for node of Ranvier of nerve :-
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AIPMTAIPMT 2002Neural Control and Coordination
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Solution:
At the level of node of Ranvier the myelin sheath is discontinuous but not the neurilemma lining. Actually myelin sheath is an integral part of Schwann's cell - which form a continuous neurilemmal covering. Each Schwann's cell wrap-around the neurite to form concentric layers of plasma membrane. But at the level of junction between two Schwann's cells myelin can not be formed and thus a gap appears.