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.
April 8, 2017. Pearloid. This is a generic name for any of a number of celluloid plastic laminates that are meant to give the overall look of mother-of-pearl or abalone, which are both expensive and becoming increasingly difficult to obtain. A great example of pearloid use is in the trapezoid-shaped fingerboard position inlays on a Gibson Les Paul Standard.