Assertion: nervous system's type | /r/CapableOf | generate layers of a fatty substance
Facets:
Source sentences:
text: A very important type of glial cell (oligodendrocytes in the central nervous system, and Schwann cells in the peripheral nervous system) generates layers of a fatty substance called myelin that wraps around axons and provides electrical insulation which allows them to transmit action potentials much more rapidly and efficiently.