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NEET2002ZoologyNeural Control and CoordinationActual

Which of the following statement is correct for node of Ranvier of nerve?

Options

  1. ANeurilemma is discontinuous.
  2. BMyelin sheath is discontinuous.
  3. CBoth neurilemma and myelin sheath are discontinuous.
  4. DCovered by myelin sheath.

Correct answer

B. Myelin sheath is discontinuous.

Step-by-step solution

Nodes of Ranvier are microscopic gaps found within myelinated axons. Their function is to speed up propagation of action potentials along the axon via saltatory conduction. Thus, the Nodes of Ranvier are the gaps between the myelin insulation of Schwann cells which insulate the axon of neuron. Related Theory:- The nodes of Ranvier allow for ions to diffuse in and out of the neuron, propagating the electrical signal down the axon. Since the nodes are spaced out, they allow for saltatory conduction, where the signal

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