myelin
mahy i lin
- n a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers
- The white matter is composed of fatty myelin sheaths that encase axons and, like insulation on a wire, make nerve-signal transmissions faster and more efficient.
- Antibodies with a low affinity for myelin-producing cells in the central nervous system may stimulate these cells to divide and develop.
- Throughout our lives, fresh layers of myelin sheathing are laid down in the brain.