GENERAL HISTOLOGY

Detailed explanation-1: -A myelin sheath is a sleeve (sheath) that’s wrapped around each nerve cell (neurons). It’s a protective layer of fat (lipids) and protein that coats the main “body” section of a neuron called the axon.

Detailed explanation-2: -Whilst the myelin sheath wraps around the axons, there are some small, uncovered gaps between the myelin sheath, which are called the nodes of Ranvier.

Detailed explanation-3: -Myelin is made by two different types of support cells. In the central nervous system (CNS)-the brain and spinal cord-cells called oligodendrocytes wrap their branch-like extensions around axons to create a myelin sheath. In the nerves outside of the spinal cord, Schwann cells produce myelin.