Nerve fibre. Transmission electron micrograph (TEM) of a section through a sciatic nerve, showing a node of Ranvier and myelinated and unmyelinated ne
Nerve fibre. Transmission electron micrograph (TEM) of a section through a sciatic nerve, showing a node of Ranvier and myelinated and unmyelinated nerve fibres (axons). Myelin (green) is a fatty insulating sheath composed of schwann cells that surrounds the axon and increases the speed of the nerve signal. Nodes of Ranvier are areas of exposed axon, with a high concentration of sodium channels. Instead of travelling continuously along the length of the axon, the impulse jumps between these nodes in a process called saltatory conduction. This allows the impulse to travel over long distances. Magnification: x10,000 when printed 10 centimetres wide.
Size: 5120px × 3418px
Photo credit: © STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: anatomical, anatomy, axon, biological, biology, body, cell, cells, conduction, cytoplasm, electron, endoneurium, fatty, fibre, fibres, gap, healthy, histological, histology, human, insulated, insulating, insulation, micrograph, microscope, myelin, myelinated, nerve, nervous, neurological, neurology, neuron, neurone, neurones, neuroscience, node, normal, ranvier, ranvierss, saltatory, schwann, sciatic, section, sectioned, sheath, sheathed, system, tem, transmission, unmyelinated, unsheathed
