Explain the structure and function of Schwann cells and nodes of Ranvier

What will be an ideal response?

Schwann cells are specialized connective tissue cells that produce myelin. Myelin forms extensive sheaths around axons that insulate and protect the nerve membranes from their surrounding environments. Axons and their associated Schwann cells are collectively referred to as nerve fibers. Local anesthetic solutions cannot diffuse through myelinated nerves except in areas where they come into direct contact with the membrane at the nodes of Ranvier.