 
 <translate> The relevant information is: Each myelin sheath is formed by the concentric wrapping of an oligodendrocyte or Schwann cell process around the axon.
So, the final answer is the concentric wrapping of an oligodendrocyte or Schwann cell process around the axon. <ibo> Ozi dị mkpa bụ: A na-akpụ akpụ myelin ọ bụla site na mkpuchi mkpuchi nke oligodendrocyte ma ọ bụ usoro Schwann cell gburugburu axon. Ya mere, azịza ikpeazụ bụ mkpuchi mkpuchi nke oligodendrocyte ma ọ bụ usoro Schwann cell gburugburu axon. 