Myelin sheath is a protective covering that surrounds the axons of nerve cells in the nervous system. Some synonyms for myelin sheath include myelin covering, myelin layer, nerve insulation, nerve fiber coating, nerve cell coating, and white matter coating. The term white matter coating is often used to describe the myelin sheath because it gives the white appearance to the areas of the brain and spinal cord where it is found. Additionally, the term nerve insulation is frequently used to describe the myelin sheath because it acts as an insulator for neural impulses and allows for faster communication within the nervous system. Regardless of the term used, the myelin sheath is an important component of the nervous system that facilitates efficient communication and helps to maintain neural health.