what are the glial cells of the cns and their functions
The central nervous system consists of neurons and glial cells. Neurons constitue about half the volume of the CNS and glial cells make up the rest. Glial cells provide support and protection for neurons. They are thus known as the supporting cells of the nervous system. The four main functions of glial cells are: to surround neurons and hold them in place, to supply nutrients and oxygen to neurons, to insulate one neuron from another, and to destroy and remove the carcasses of dead neurons (clean up).
Another type of glial cell in the central nervous system are oligodendrocytes, which creates myelin sheaths around the axons of neurons. The myelin sheath helps your neurons conduct signals more quickly between one another and other cells. Finally, star-shaped glial cells in the CNS are collectively known as astrocytes.