Question

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

Answer 1

The correct option is D myelin sheath is discontinuous

Myelinated Nerve Fibers are nerve fibers that are insulated by a myelin sheath. Nodes of Ranvier occurs where myelin sheath is discontinuous. Nodes of Ranvier are microscopic gaps (which makes the myelin sheath discontinuous) found within myelinated axons, which helps to speed up propagation of action potentials along the axon via saltatory conduction.