Most of the axons in the central nervous system are wrapped in myelin, a substance rich in lipids (fatty substances) and proteins. Like the coating around an electrical wire, myelin insulates and protects the axon and helps speed nerve transmission.
Potato/Semi Round Pearls. Potato pearls are some of the less expensive freshwater pearls to be found on the market, but their look is anything but cheap. You can purchase potato pearls in every color of the rainbow, and craft beautiful one of a kind creations for gifts and your own collection.
Loose potato pearl stands>>. Many potato pearls are so close to being symmetrical that from a foot away no-one will be able to tell they arent perfectly round. You can string and knot them just like spherical pearls, at a fraction of the cost.