A layer of myelin encasing (and insulating) the axons of medullated nerve fibers.
Results from our forum
... okay, 7 to 2.3 m/sec Now, if those are myelinated: myelin sheath n. The insulating envelope of myelin that surrounds the core of a ... and, in the central nervous system, from oligodendrocytes. Also called medullary sheath." http://www.answers.com/topic/myelin-1 Okay, now.......if ...
See entire post