So basically we have satellite cells and Schwann cells. Now, the function of satellite cells is very similar to the function of astrocytes but the structure of satellite cells is somewhat different. So the satellite cells actually cover the outside surface of the neurons and they basically provide a supply of nutrients and other things into our cells, into our neurons. On top of that, they also give structure and support to our neurons and they protect and cushion those neurons so that they aren't damaged in any way. Now, Schwann cells are very similar to oligodendrocytes in a sense that they create the myelin on the neurons found in the peripheral nervous system. So these Schwann cells basically attach physically attached to our sections on our axon and then they secrete that myelin material onto our axon.