Definition that contains myelin
- ms a chronic progressive nervous disorder involving loss of myelin sheath around certain nerve fibers
- cortex the layer of unmyelinated neurons (the grey matter) forming the cortex of the cerebrum
- tract a bundle of myelinated nerve fibers following a path through the brain
- pathway a bundle of myelinated nerve fibers following a path through the brain
- myelin sheath a layer of myelin encasing (and insulating) the axons of medullated nerve fibers
- myenteric plexus a plexus of unmyelinated fibers and postganglionic autonomic cell bodies in the muscular coat of the esophagus and stomach and intestines
- gray matter greyish nervous tissue containing cell bodies as well as fibers; forms the cerebral cortex consisting of unmyelinated neurons
- peduncle a bundle of myelinated neurons joining different parts of the brain
- schwann cell any cell that covers the nerve fibers in the peripheral nervous system and forms the myelin sheath
- unmyelinated (of neurons) not myelinated