Superior view of the brain revealing the visual pathway and superior sagittal sinus. Electrical nerve impulses travel from the eyes to the occipital lobe in the back of the brain via millions of nerves fibers that make up the visual pathway.
Myelinated nerves. A section through myelinated nerve fibres and Schwann cells.Myelin (green) is an insulating fatty layer that surrounds the nerve fibre (axon, black), increasing the speed at which nerve impulses travel.
researchers used a recently-developed method called diffusion spectrum imaging to infer the position of nerve fibers in the living human brain from the way water flows through and around them. These scans revealed an orderly weave of fibers — a much simpler organization than many scientists would have suspected.