Medullary sheath

The medullary sheath, also called the myelin sheath, is a protective covering that surrounds certain nerve fibers in the body. It is made of a fatty substance called myelin, which insulates the nerve fibers, helping electrical signals travel quickly and efficiently along the nerves. This rapid signal transmission is essential for proper functioning of movement, sensation, and coordination. The sheath is formed by specialized cells and is essential for the health of the nervous system. Damage to the medullary sheath can lead to neurological problems, as it disrupts the normal flow of nerve signals.