Nerve fibre node. Transmission electron micrograph (TEM) of a section through a nerve fibre (axon) at a node of Ranvier. The axon (purple,centre) is surrounded by a fatty insulating sheath of myelin (red),which 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: x12,000 when printed 10 centimetres wide | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Gschmeissner, Steve |
Bildgröße: | 4723 px × 3707 px |
Modell-Rechte: | nicht erforderlich |
Restrictions: | - |