84.Node of Ranvier occurs where: A. Nerve is covered with myelin sheath B. Neurilemma is discontinuous C. Neurilemma and myelin sheath are discontinuous D. Myelin sheath is discontinuous
Option D Neurilemma and myelin sheath are discontinuous: to have a node of Ranvier myelin sheath should be absent but it is not necessary that neurilemma can be discontinuous. Myelin sheath is discontinuous: when myelin sheath is discontinuous it leads to formation of the Node of Ranvier
