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.

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✯ Nerve fibres :: Myelinated nerve fibres, coloured scanning electron micrograph (SEM). The myelin sheath is pink, the axoplasm is dark brown and the endoneurium (connective tissue) is yellow.✯

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Cross-section of a nerve showing nerve fibers organized into fascicles that are enclosed by a band of connective tissue called epineurium. SEM X900

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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.

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Skin cross-section, showing the epidermis, dermis, perichondrium, elastic cartilage, a myelinated nerve fiber, and a muscular artery. Colorised SEM X160.

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Colored SEM of an oligodendrocyte. This cell forms the myelin sheaths around nerve fibers in the CNS (brain and spinal cord).

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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.

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