2-Minute Neuroscience: Myelin

In this video, I discuss myelin, an insulatory layer that covers the axons of many neurons in the nervous system. I describe myelin's role in promoting efficient neuronal signaling, and I discuss its structure, which consists of stretches of myelin called internodes surrounding intermittent gaps in myelin called nodes of Ranvier. I also discuss the cells that form myelin: Schwann cells in the peripheral nervous system and oligodendrocytes in the central nervous system.