ABSTRACT
An axon is covered in myelin, which is produced in the PNS by the Schwann cell. In the CNS, myelin is produced by another kind of cell, the oligodendrocyte. Nodes of Ranvier are small areas along the axon that do not contain myelin. Myelin allows for much more rapid transmission of action potentials, as they can jump between Nodes of Ranvier as shown in Fig. 1.2.
