ANATOMY

Detailed explanation-1: -One oligodendrocyte forms myelin sheath segments for several neurons, whereas a single Schwann cell myelinates one segment for a single neuron. During the development of the vertebrate nervous system, myelination starts around birth first in the PNS, then the spinal cord and finally in the brain.

Detailed explanation-2: -Myelin sheath formation: Schwann cell wraps its plasma membrane concentrically around the inner axon, the nucleus remaining fixed whilst the inner turn of the glial cell membrane spirals around the axon to add membrane layers the myelin sheath.

Detailed explanation-3: -Myelin is made by oligodendrocytes in your brain and spinal cord (your central nervous system [CNS]) and by Schwann cells in your peripheral nervous system.

Detailed explanation-4: -Myelin is an insulating layer, or sheath that forms around nerves, including those in the brain and spinal cord. It is made up of protein and fatty substances. This myelin sheath allows electrical impulses to transmit quickly and efficiently along the nerve cells. If myelin is damaged, these impulses slow down.

Detailed explanation-5: -Made of lipids and proteins, myelin was later found to wrap around the axons of neurons. 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.