Question

Node of Ranvier is a place where

• A. Medulla sheath is discontinuous
• B. Medullary sheath and neurilemma is discontinuous
• C. Axolemma is absent
• D. Axolemma is discontinuous

Answer 1

The correct option is A Medulla sheath is discontinuous

• The node of Ranvier is the name given to the region in a neuron where the medulla sheath or myelin sheath of the nerve is discontinuous.
  
• Neurilemma is the cytoplasmic sheath of Schwan cells present over the myelinated axon continuously. It is also present along the nodes of Ranvier.
  
• Axolemma is also present at the nodes of Ranvier.

So, the correct answer is 'Medulla sheath is discontinuous'.