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anatomy
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Also known as: nerve fibre
Article History
Category: Science & Tech
Also called:
nerve fibre
Key People:
Ragnar Arthur Granit
Emil Heinrich Du Bois-Reymond
Robert Remak
Ross Granville Harrison
Joseph Erlanger
Related Topics:
node of Ranvier
myelin
giant nerve fibre
growth cone
efferent nerve fibre
See all related content →

axon, portion of a nerve cell (neuron) that carries nerve impulses away from the cell body. A neuron typically has one axon that connects it with other neurons or with muscle or gland cells. Some axons may be quite long, reaching, for example, from the spinal cord down to a toe. Most axons of vertebrates are enclosed in a myelin sheath, which increases the speed of impulse transmission; some large axons may transmit impulses at speeds up to 90 metres (300 feet) per second.